diff --git a/http-ui/public/updates-script.js b/http-ui/public/updates-script.js
index c034c45b8..5d439a7f5 100644
--- a/http-ui/public/updates-script.js
+++ b/http-ui/public/updates-script.js
@@ -54,13 +54,22 @@ $(window).on('load', function () {
       const content = $(`#${id} .updateStatus.content`);
 
       let html;
-      let { type, processed_number_of_documents, total_number_of_documents } = status.meta;
-      if (type === 'DocumentsAddition' && processed_number_of_documents && total_number_of_documents) {
-        let progress = Math.round(processed_number_of_documents / total_number_of_documents * 100);
+
+      let { type, step, total_steps, current, total } = status.meta;
+
+      if (type === 'DocumentsAddition') {
+        // If the total is null or undefined then the progress results is infinity.
+        let progress = Math.round(current / total * 100);
+        // We must divide the progress by the total number of indexing steps.
+        progress = progress / total_steps;
+        // And mark the previous steps as processed.
+        progress = progress + (step * 100 / total_steps);
+        // Generate the appropriate html bulma progress bar.
         html = `<progress class="progress" title="${progress}%" value="${progress}" max="100"></progress>`;
       } else {
         html = `<progress class="progress" max="100"></progress>`;
       }
+
       content.html(html);
     }
 
diff --git a/http-ui/src/main.rs b/http-ui/src/main.rs
index 281eb0c8e..2af2c9d90 100644
--- a/http-ui/src/main.rs
+++ b/http-ui/src/main.rs
@@ -26,6 +26,7 @@ use warp::filters::ws::Message;
 use warp::{Filter, http::Response};
 
 use milli::tokenizer::{simple_tokenizer, TokenType};
+use milli::update::UpdateIndexingStep::*;
 use milli::update::{UpdateBuilder, IndexDocumentsMethod, UpdateFormat};
 use milli::{obkv_to_json, Index, UpdateStore, SearchResult};
 
@@ -201,8 +202,10 @@ enum UpdateMeta {
 #[serde(tag = "type")]
 enum UpdateMetaProgress {
     DocumentsAddition {
-        processed_number_of_documents: usize,
-        total_number_of_documents: Option<usize>,
+        step: usize,
+        total_steps: usize,
+        current: usize,
+        total: Option<usize>,
     },
 }
 
@@ -310,12 +313,20 @@ async fn main() -> anyhow::Result<()> {
                         Box::new(content) as Box<dyn io::Read>
                     };
 
-                    let result = builder.execute(reader, |count, total| {
+                    let result = builder.execute(reader, |indexing_step| {
+                        let (current, total) = match indexing_step {
+                            TransformFromUserIntoGenericFormat { documents_seen } => (documents_seen, None),
+                            ComputeIdsAndMergeDocuments { documents_seen, total_documents } => (documents_seen, Some(total_documents)),
+                            IndexDocuments { documents_seen, total_documents } => (documents_seen, Some(total_documents)),
+                            MergeDataIntoFinalDatabase { databases_seen, total_databases } => (databases_seen, Some(total_databases)),
+                        };
                         let _ = update_status_sender_cloned.send(UpdateStatus::Progressing {
                             update_id,
                             meta: UpdateMetaProgress::DocumentsAddition {
-                                processed_number_of_documents: count,
-                                total_number_of_documents: Some(total),
+                                step: indexing_step.step(),
+                                total_steps: indexing_step.number_of_steps(),
+                                current,
+                                total,
                             }
                         });
                     });
@@ -356,12 +367,20 @@ async fn main() -> anyhow::Result<()> {
                         }
                     }
 
-                    let result = builder.execute(|count, total| {
+                    let result = builder.execute(|indexing_step| {
+                        let (current, total) = match indexing_step {
+                            TransformFromUserIntoGenericFormat { documents_seen } => (documents_seen, None),
+                            ComputeIdsAndMergeDocuments { documents_seen, total_documents } => (documents_seen, Some(total_documents)),
+                            IndexDocuments { documents_seen, total_documents } => (documents_seen, Some(total_documents)),
+                            MergeDataIntoFinalDatabase { databases_seen, total_databases } => (databases_seen, Some(total_databases)),
+                        };
                         let _ = update_status_sender_cloned.send(UpdateStatus::Progressing {
                             update_id,
                             meta: UpdateMetaProgress::DocumentsAddition {
-                                processed_number_of_documents: count,
-                                total_number_of_documents: Some(total),
+                                step: indexing_step.step(),
+                                total_steps: indexing_step.number_of_steps(),
+                                current,
+                                total,
                             }
                         });
                     });
diff --git a/src/update/index_documents/mod.rs b/src/update/index_documents/mod.rs
index ad542d0f0..f078ec9ed 100644
--- a/src/update/index_documents/mod.rs
+++ b/src/update/index_documents/mod.rs
@@ -15,6 +15,7 @@ use rayon::prelude::*;
 use rayon::ThreadPool;
 
 use crate::index::Index;
+use crate::update::UpdateIndexingStep;
 use self::store::Store;
 use self::merge_function::{
     main_merge, word_docids_merge, words_pairs_proximities_docids_merge,
@@ -249,13 +250,14 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
     pub fn execute<R, F>(self, reader: R, progress_callback: F) -> anyhow::Result<()>
     where
         R: io::Read,
-        F: Fn(usize, usize) + Sync,
+        F: Fn(UpdateIndexingStep) + Sync,
     {
         let before_transform = Instant::now();
 
         let transform = Transform {
             rtxn: &self.wtxn,
             index: self.index,
+            log_every_n: self.log_every_n,
             chunk_compression_type: self.chunk_compression_type,
             chunk_compression_level: self.chunk_compression_level,
             chunk_fusing_shrink_size: self.chunk_fusing_shrink_size,
@@ -266,9 +268,9 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
         };
 
         let output = match self.update_format {
-            UpdateFormat::Csv => transform.from_csv(reader)?,
-            UpdateFormat::Json => transform.from_json(reader)?,
-            UpdateFormat::JsonStream => transform.from_json_stream(reader)?,
+            UpdateFormat::Csv => transform.from_csv(reader, &progress_callback)?,
+            UpdateFormat::Json => transform.from_json(reader, &progress_callback)?,
+            UpdateFormat::JsonStream => transform.from_json_stream(reader, &progress_callback)?,
         };
 
         info!("Update transformed in {:.02?}", before_transform.elapsed());
@@ -278,7 +280,7 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
 
     pub fn execute_raw<F>(self, output: TransformOutput, progress_callback: F) -> anyhow::Result<()>
     where
-        F: Fn(usize, usize) + Sync
+        F: Fn(UpdateIndexingStep) + Sync
     {
         let before_indexing = Instant::now();
 
@@ -460,6 +462,12 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
         documents_ids.union_with(&replaced_documents_ids);
         self.index.put_documents_ids(self.wtxn, &documents_ids)?;
 
+        let mut database_count = 0;
+        progress_callback(UpdateIndexingStep::MergeDataIntoFinalDatabase {
+            databases_seen: 0,
+            total_databases: 5,
+        });
+
         debug!("Writing the docid word positions into LMDB on disk...");
         merge_into_lmdb_database(
             self.wtxn,
@@ -469,6 +477,12 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
             write_method
         )?;
 
+        database_count += 1;
+        progress_callback(UpdateIndexingStep::MergeDataIntoFinalDatabase {
+            databases_seen: database_count,
+            total_databases: 5,
+        });
+
         debug!("Writing the documents into LMDB on disk...");
         merge_into_lmdb_database(
             self.wtxn,
@@ -478,6 +492,12 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
             write_method
         )?;
 
+        database_count += 1;
+        progress_callback(UpdateIndexingStep::MergeDataIntoFinalDatabase {
+            databases_seen: database_count,
+            total_databases: 5,
+        });
+
         debug!("Writing the words pairs proximities docids into LMDB on disk...");
         merge_into_lmdb_database(
             self.wtxn,
@@ -487,6 +507,12 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
             write_method,
         )?;
 
+        database_count += 1;
+        progress_callback(UpdateIndexingStep::MergeDataIntoFinalDatabase {
+            databases_seen: database_count,
+            total_databases: 5,
+        });
+
         for (db_type, result) in receiver {
             let content = result?;
             match db_type {
@@ -512,8 +538,16 @@ impl<'t, 'u, 'i, 'a> IndexDocuments<'t, 'u, 'i, 'a> {
                     )?;
                 },
             }
+
+            database_count += 1;
+            progress_callback(UpdateIndexingStep::MergeDataIntoFinalDatabase {
+                databases_seen: database_count,
+                total_databases: 5,
+            });
         }
 
+        debug_assert_eq!(database_count, 5);
+
         info!("Transform output indexed in {:.02?}", before_indexing.elapsed());
 
         Ok(())
@@ -537,7 +571,7 @@ mod tests {
         let content = &b"id,name\n1,kevin\n2,kevina\n3,benoit\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 3 documents now.
@@ -551,7 +585,7 @@ mod tests {
         let content = &b"id,name\n1,updated kevin\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is **always** 3 documents.
@@ -565,7 +599,7 @@ mod tests {
         let content = &b"id,name\n1,updated second kevin\n2,updated kevina\n3,updated benoit\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is **always** 3 documents.
@@ -589,7 +623,7 @@ mod tests {
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
         builder.index_documents_method(IndexDocumentsMethod::UpdateDocuments);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is only 1 document now.
@@ -616,7 +650,7 @@ mod tests {
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
         builder.index_documents_method(IndexDocumentsMethod::UpdateDocuments);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is **always** 1 document.
@@ -652,7 +686,7 @@ mod tests {
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.disable_autogenerate_docids();
         builder.update_format(UpdateFormat::Csv);
-        assert!(builder.execute(content, |_, _| ()).is_err());
+        assert!(builder.execute(content, |_| ()).is_err());
         wtxn.commit().unwrap();
 
         // Check that there is no document.
@@ -679,7 +713,7 @@ mod tests {
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.disable_autogenerate_docids();
         builder.update_format(UpdateFormat::Json);
-        assert!(builder.execute(content, |_, _| ()).is_err());
+        assert!(builder.execute(content, |_| ()).is_err());
         wtxn.commit().unwrap();
 
         // Check that there is no document.
@@ -701,7 +735,7 @@ mod tests {
         let content = &b"name\nkevin\nkevina\nbenoit\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 3 documents now.
@@ -719,7 +753,7 @@ mod tests {
         let content = format!("id,name\n{},updated kevin", kevin_uuid);
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content.as_bytes(), |_, _| ()).unwrap();
+        builder.execute(content.as_bytes(), |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is **always** 3 documents.
@@ -754,7 +788,7 @@ mod tests {
         let content = &b"id,name\n1,kevin\n2,kevina\n3,benoit\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 3 documents now.
@@ -768,7 +802,7 @@ mod tests {
         let content = &b"name\nnew kevin"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 4 documents now.
@@ -790,7 +824,7 @@ mod tests {
         let content = &b"id,name\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is no documents.
@@ -816,7 +850,7 @@ mod tests {
         ]"#[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Json);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 3 documents now.
@@ -838,7 +872,7 @@ mod tests {
         let content = &b"[]"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Json);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is no documents.
@@ -864,7 +898,7 @@ mod tests {
         "#[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::JsonStream);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 3 documents now.
@@ -887,7 +921,7 @@ mod tests {
         let content = &b"id,name\nbrume bleue,kevin\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        assert!(builder.execute(content, |_, _| ()).is_err());
+        assert!(builder.execute(content, |_| ()).is_err());
         wtxn.commit().unwrap();
 
         // First we send 1 document with a valid id.
@@ -896,7 +930,7 @@ mod tests {
         let content = &b"id,name\n32,kevin\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 1 document now.
@@ -922,7 +956,7 @@ mod tests {
         ]"#[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Json);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that there is 1 documents now.
diff --git a/src/update/index_documents/store.rs b/src/update/index_documents/store.rs
index 1503ef5fb..6d42f0119 100644
--- a/src/update/index_documents/store.rs
+++ b/src/update/index_documents/store.rs
@@ -16,6 +16,7 @@ use tempfile::tempfile;
 
 use crate::heed_codec::{BoRoaringBitmapCodec, CboRoaringBitmapCodec};
 use crate::tokenizer::{simple_tokenizer, only_token};
+use crate::update::UpdateIndexingStep;
 use crate::{json_to_string, SmallVec32, Position, DocumentId};
 
 use super::{MergeFn, create_writer, create_sorter, writer_into_reader};
@@ -294,7 +295,7 @@ impl Store {
         log_every_n: Option<usize>,
         mut progress_callback: F,
     ) -> anyhow::Result<Readers>
-    where F: FnMut(usize, usize),
+    where F: FnMut(UpdateIndexingStep),
     {
         debug!("{:?}: Indexing in a Store...", thread_index);
 
@@ -311,7 +312,10 @@ impl Store {
                 // This is a log routine that we do every `log_every_n` documents.
                 if log_every_n.map_or(false, |len| count % len == 0) {
                     info!("We have seen {} documents so far ({:.02?}).", format_count(count), before.elapsed());
-                    progress_callback(count, documents_count);
+                    progress_callback(UpdateIndexingStep::IndexDocuments {
+                        documents_seen: count,
+                        total_documents: documents_count,
+                    });
                     before = Instant::now();
                 }
 
@@ -343,7 +347,10 @@ impl Store {
             count = count + 1;
         }
 
-        progress_callback(count, documents_count);
+        progress_callback(UpdateIndexingStep::IndexDocuments {
+            documents_seen: count,
+            total_documents: documents_count,
+        });
 
         let readers = self.finish()?;
         debug!("{:?}: Store created!", thread_index);
diff --git a/src/update/index_documents/transform.rs b/src/update/index_documents/transform.rs
index cb583849a..9847998a5 100644
--- a/src/update/index_documents/transform.rs
+++ b/src/update/index_documents/transform.rs
@@ -11,7 +11,7 @@ use roaring::RoaringBitmap;
 use serde_json::{Map, Value};
 
 use crate::{BEU32, MergeFn, Index, FieldsIdsMap};
-use crate::update::AvailableDocumentsIds;
+use crate::update::{AvailableDocumentsIds, UpdateIndexingStep};
 use super::merge_function::merge_two_obkvs;
 use super::{create_writer, create_sorter, IndexDocumentsMethod};
 
@@ -34,6 +34,7 @@ pub struct TransformOutput {
 pub struct Transform<'t, 'i> {
     pub rtxn: &'t heed::RoTxn<'i>,
     pub index: &'i Index,
+    pub log_every_n: Option<usize>,
     pub chunk_compression_type: CompressionType,
     pub chunk_compression_level: Option<u32>,
     pub chunk_fusing_shrink_size: Option<u64>,
@@ -44,15 +45,32 @@ pub struct Transform<'t, 'i> {
 }
 
 impl Transform<'_, '_> {
-    pub fn from_json<R: Read>(self, reader: R) -> anyhow::Result<TransformOutput> {
-        self.from_generic_json(reader, false)
+    pub fn from_json<R, F>(self, reader: R, progress_callback: F) -> anyhow::Result<TransformOutput>
+    where
+        R: Read,
+        F: Fn(UpdateIndexingStep) + Sync,
+    {
+        self.from_generic_json(reader, false, progress_callback)
     }
 
-    pub fn from_json_stream<R: Read>(self, reader: R) -> anyhow::Result<TransformOutput> {
-        self.from_generic_json(reader, true)
+    pub fn from_json_stream<R, F>(self, reader: R, progress_callback: F) -> anyhow::Result<TransformOutput>
+    where
+        R: Read,
+        F: Fn(UpdateIndexingStep) + Sync,
+    {
+        self.from_generic_json(reader, true, progress_callback)
     }
 
-    fn from_generic_json<R: Read>(self, reader: R, is_stream: bool) -> anyhow::Result<TransformOutput> {
+    fn from_generic_json<R, F>(
+        self,
+        reader: R,
+        is_stream: bool,
+        progress_callback: F,
+    ) -> anyhow::Result<TransformOutput>
+    where
+        R: Read,
+        F: Fn(UpdateIndexingStep) + Sync,
+    {
         let mut fields_ids_map = self.index.fields_ids_map(self.rtxn)?;
         let users_ids_documents_ids = self.index.users_ids_documents_ids(self.rtxn).unwrap();
         let primary_key = self.index.primary_key(self.rtxn)?;
@@ -131,10 +149,17 @@ impl Transform<'_, '_> {
         let mut json_buffer = Vec::new();
         let mut obkv_buffer = Vec::new();
         let mut uuid_buffer = [0; uuid::adapter::Hyphenated::LENGTH];
+        let mut documents_count = 0;
 
         for result in documents {
             let document = result?;
 
+            if self.log_every_n.map_or(false, |len| documents_count % len == 0) {
+                progress_callback(UpdateIndexingStep::TransformFromUserIntoGenericFormat {
+                    documents_seen: documents_count,
+                });
+            }
+
             obkv_buffer.clear();
             let mut writer = obkv::KvWriter::new(&mut obkv_buffer);
 
@@ -186,14 +211,30 @@ impl Transform<'_, '_> {
 
             // We use the extracted/generated user id as the key for this document.
             sorter.insert(user_id.as_bytes(), &obkv_buffer)?;
+            documents_count += 1;
         }
 
+        progress_callback(UpdateIndexingStep::TransformFromUserIntoGenericFormat {
+            documents_seen: documents_count,
+        });
+
         // Now that we have a valid sorter that contains the user id and the obkv we
         // give it to the last transforming function which returns the TransformOutput.
-        self.from_sorter(sorter, primary_key, fields_ids_map, users_ids_documents_ids)
+        self.from_sorter(
+            sorter,
+            primary_key,
+            fields_ids_map,
+            documents_count,
+            users_ids_documents_ids,
+            progress_callback,
+        )
     }
 
-    pub fn from_csv<R: Read>(self, reader: R) -> anyhow::Result<TransformOutput> {
+    pub fn from_csv<R, F>(self, reader: R, progress_callback: F) -> anyhow::Result<TransformOutput>
+    where
+        R: Read,
+        F: Fn(UpdateIndexingStep) + Sync,
+    {
         let mut fields_ids_map = self.index.fields_ids_map(self.rtxn)?;
         let users_ids_documents_ids = self.index.users_ids_documents_ids(self.rtxn).unwrap();
 
@@ -255,12 +296,19 @@ impl Transform<'_, '_> {
         let mut json_buffer = Vec::new();
         let mut obkv_buffer = Vec::new();
         let mut uuid_buffer = [0; uuid::adapter::Hyphenated::LENGTH];
+        let mut documents_count = 0;
 
         let mut record = csv::StringRecord::new();
         while csv.read_record(&mut record)? {
             obkv_buffer.clear();
             let mut writer = obkv::KvWriter::new(&mut obkv_buffer);
 
+            if self.log_every_n.map_or(false, |len| documents_count % len == 0) {
+                progress_callback(UpdateIndexingStep::TransformFromUserIntoGenericFormat {
+                    documents_seen: documents_count,
+                });
+            }
+
             // We extract the user id if we know where it is or generate an UUID V4 otherwise.
             let user_id = match user_id_pos {
                 Some(pos) => {
@@ -292,23 +340,39 @@ impl Transform<'_, '_> {
 
             // We use the extracted/generated user id as the key for this document.
             sorter.insert(user_id, &obkv_buffer)?;
+            documents_count += 1;
         }
 
+        progress_callback(UpdateIndexingStep::TransformFromUserIntoGenericFormat {
+            documents_seen: documents_count,
+        });
+
         // Now that we have a valid sorter that contains the user id and the obkv we
         // give it to the last transforming function which returns the TransformOutput.
-        self.from_sorter(sorter, primary_key_field_id, fields_ids_map, users_ids_documents_ids)
+        self.from_sorter(
+            sorter,
+            primary_key_field_id,
+            fields_ids_map,
+            documents_count,
+            users_ids_documents_ids,
+            progress_callback,
+        )
     }
 
     /// Generate the `TransformOutput` based on the given sorter that can be generated from any
     /// format like CSV, JSON or JSON stream. This sorter must contain a key that is the document
     /// id for the user side and the value must be an obkv where keys are valid fields ids.
-    fn from_sorter(
+    fn from_sorter<F>(
         self,
         sorter: grenad::Sorter<MergeFn>,
         primary_key: u8,
         fields_ids_map: FieldsIdsMap,
+        approximate_number_of_documents: usize,
         users_ids_documents_ids: fst::Map<Cow<'_, [u8]>>,
+        progress_callback: F,
     ) -> anyhow::Result<TransformOutput>
+    where
+        F: Fn(UpdateIndexingStep) + Sync,
     {
         let documents_ids = self.index.documents_ids(self.rtxn)?;
         let mut available_documents_ids = AvailableDocumentsIds::from_documents_ids(&documents_ids);
@@ -332,6 +396,13 @@ impl Transform<'_, '_> {
         let mut iter = sorter.into_iter()?;
         while let Some((user_id, update_obkv)) = iter.next()? {
 
+            if self.log_every_n.map_or(false, |len| documents_count % len == 0) {
+                progress_callback(UpdateIndexingStep::ComputeIdsAndMergeDocuments {
+                    documents_seen: documents_count,
+                    total_documents: approximate_number_of_documents,
+                });
+            }
+
             let (docid, obkv) = match users_ids_documents_ids.get(user_id) {
                 Some(docid) => {
                     // If we find the user id in the current users ids documents ids map
@@ -369,6 +440,11 @@ impl Transform<'_, '_> {
             documents_count += 1;
         }
 
+        progress_callback(UpdateIndexingStep::ComputeIdsAndMergeDocuments {
+            documents_seen: documents_count,
+            total_documents: documents_count,
+        });
+
         // We create a final writer to write the new documents in order from the sorter.
         let file = tempfile::tempfile()?;
         let mut writer = create_writer(self.chunk_compression_type, self.chunk_compression_level, file)?;
diff --git a/src/update/mod.rs b/src/update/mod.rs
index 3582820b4..75724269a 100644
--- a/src/update/mod.rs
+++ b/src/update/mod.rs
@@ -4,6 +4,7 @@ mod delete_documents;
 mod index_documents;
 mod settings;
 mod update_builder;
+mod update_step;
 mod update_store;
 
 pub use self::available_documents_ids::AvailableDocumentsIds;
@@ -12,4 +13,5 @@ pub use self::delete_documents::DeleteDocuments;
 pub use self::index_documents::{IndexDocuments, IndexDocumentsMethod, UpdateFormat};
 pub use self::settings::Settings;
 pub use self::update_builder::UpdateBuilder;
+pub use self::update_step::UpdateIndexingStep;
 pub use self::update_store::UpdateStore;
diff --git a/src/update/settings.rs b/src/update/settings.rs
index 427f0e926..ad191ceec 100644
--- a/src/update/settings.rs
+++ b/src/update/settings.rs
@@ -3,7 +3,7 @@ use grenad::CompressionType;
 use rayon::ThreadPool;
 
 use crate::update::index_documents::{Transform, IndexDocumentsMethod};
-use crate::update::{ClearDocuments, IndexDocuments};
+use crate::update::{ClearDocuments, IndexDocuments, UpdateIndexingStep};
 use crate::{Index, FieldsIdsMap};
 
 pub struct Settings<'a, 't, 'u, 'i> {
@@ -60,7 +60,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
 
     pub fn execute<F>(self, progress_callback: F) -> anyhow::Result<()>
     where
-        F: Fn(usize, usize) + Sync
+        F: Fn(UpdateIndexingStep) + Sync
     {
         // Check that the searchable attributes have been specified.
         if let Some(value) = self.searchable_fields {
@@ -126,6 +126,7 @@ impl<'a, 't, 'u, 'i> Settings<'a, 't, 'u, 'i> {
             let transform = Transform {
                 rtxn: &self.wtxn,
                 index: self.index,
+                log_every_n: self.log_every_n,
                 chunk_compression_type: self.chunk_compression_type,
                 chunk_compression_level: self.chunk_compression_level,
                 chunk_fusing_shrink_size: self.chunk_fusing_shrink_size,
@@ -231,14 +232,14 @@ mod tests {
         let content = &b"name,age\nkevin,23\nkevina,21\nbenoit,34\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // We change the searchable fields to be the "name" field only.
         let mut wtxn = index.write_txn().unwrap();
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.set_searchable_fields(vec!["name".into()]);
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the searchable field is correctly set to "name" only.
@@ -260,7 +261,7 @@ mod tests {
         let mut wtxn = index.write_txn().unwrap();
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.reset_searchable_fields();
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the searchable field have been reset and documents are found now.
@@ -286,7 +287,7 @@ mod tests {
         let content = &b"name,age\nkevin,23\nkevina,21\nbenoit,34\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // In the same transaction we change the displayed fields to be only the "age".
@@ -295,7 +296,7 @@ mod tests {
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.set_displayed_fields(vec!["age".into()]);
         builder.set_searchable_fields(vec!["name".into()]);
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the displayed fields are correctly set to `None` (default value).
@@ -310,7 +311,7 @@ mod tests {
         let mut wtxn = index.write_txn().unwrap();
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.reset_searchable_fields();
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the displayed fields always contains only the "age" field.
@@ -334,7 +335,7 @@ mod tests {
         let content = &b"name,age\nkevin,23\nkevina,21\nbenoit,34\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the displayed fields are correctly set to `None` (default value).
@@ -356,12 +357,12 @@ mod tests {
         let content = &b"name,age\nkevin,23\nkevina,21\nbenoit,34\n"[..];
         let mut builder = IndexDocuments::new(&mut wtxn, &index);
         builder.update_format(UpdateFormat::Csv);
-        builder.execute(content, |_, _| ()).unwrap();
+        builder.execute(content, |_| ()).unwrap();
 
         // In the same transaction we change the displayed fields to be only the age.
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.set_displayed_fields(vec!["age".into()]);
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the displayed fields are correctly set to only the "age" field.
@@ -376,7 +377,7 @@ mod tests {
         let mut wtxn = index.write_txn().unwrap();
         let mut builder = Settings::new(&mut wtxn, &index);
         builder.reset_displayed_fields();
-        builder.execute(|_, _| ()).unwrap();
+        builder.execute(|_| ()).unwrap();
         wtxn.commit().unwrap();
 
         // Check that the displayed fields are correctly set to `None` (default value).
diff --git a/src/update/update_step.rs b/src/update/update_step.rs
new file mode 100644
index 000000000..68a32bb67
--- /dev/null
+++ b/src/update/update_step.rs
@@ -0,0 +1,36 @@
+use UpdateIndexingStep::*;
+
+#[derive(Debug, Clone, Copy)]
+pub enum UpdateIndexingStep {
+    /// Transform from the original user given format (CSV, JSON, JSON lines)
+    /// into a generic format based on the obkv and grenad crates. This step also
+    /// deduplicate potential documents in this batch update by merging or replacing them.
+    TransformFromUserIntoGenericFormat { documents_seen: usize },
+
+    /// This step check the external document id, computes the internal ids and merge
+    /// the documents that are already present in the database.
+    ComputeIdsAndMergeDocuments { documents_seen: usize, total_documents: usize },
+
+    /// Extract the documents words using the tokenizer and compute the documents
+    /// facets. Stores those words, facets and documents ids on disk.
+    IndexDocuments { documents_seen: usize, total_documents: usize },
+
+    /// Merge the previously extracted data (words and facets) into the final LMDB database.
+    /// These extracted data are split into multiple databases.
+    MergeDataIntoFinalDatabase { databases_seen: usize, total_databases: usize },
+}
+
+impl UpdateIndexingStep {
+    pub const fn step(&self) -> usize {
+        match self {
+            TransformFromUserIntoGenericFormat { .. } => 0,
+            ComputeIdsAndMergeDocuments { .. } => 1,
+            IndexDocuments { .. } => 2,
+            MergeDataIntoFinalDatabase { .. } => 3,
+        }
+    }
+
+    pub const fn number_of_steps(&self) -> usize {
+        4
+    }
+}