diff --git a/crates/benchmarks/benches/indexing.rs b/crates/benchmarks/benches/indexing.rs
index 3210a6e7d..2f33c3454 100644
--- a/crates/benchmarks/benches/indexing.rs
+++ b/crates/benchmarks/benches/indexing.rs
@@ -150,6 +150,7 @@ fn indexing_songs_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -215,6 +216,7 @@ fn reindexing_songs_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -258,6 +260,7 @@ fn reindexing_songs_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -325,6 +328,7 @@ fn deleting_songs_in_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -400,6 +404,7 @@ fn indexing_songs_in_three_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -443,6 +448,7 @@ fn indexing_songs_in_three_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -482,6 +488,7 @@ fn indexing_songs_in_three_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -548,6 +555,7 @@ fn indexing_songs_without_faceted_numbers(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -613,6 +621,7 @@ fn indexing_songs_without_faceted_fields(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -678,6 +687,7 @@ fn indexing_wiki(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -742,6 +752,7 @@ fn reindexing_wiki(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -785,6 +796,7 @@ fn reindexing_wiki(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -851,6 +863,7 @@ fn deleting_wiki_in_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -926,6 +939,7 @@ fn indexing_wiki_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -970,6 +984,7 @@ fn indexing_wiki_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1010,6 +1025,7 @@ fn indexing_wiki_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1075,6 +1091,7 @@ fn indexing_movies_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1139,6 +1156,7 @@ fn reindexing_movies_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1182,6 +1200,7 @@ fn reindexing_movies_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1248,6 +1267,7 @@ fn deleting_movies_in_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1358,6 +1378,7 @@ fn indexing_movies_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1401,6 +1422,7 @@ fn indexing_movies_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1440,6 +1462,7 @@ fn indexing_movies_in_three_batches(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1528,6 +1551,7 @@ fn indexing_nested_movies_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1617,6 +1641,7 @@ fn deleting_nested_movies_in_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1698,6 +1723,7 @@ fn indexing_nested_movies_without_faceted_fields(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1763,6 +1789,7 @@ fn indexing_geo(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1827,6 +1854,7 @@ fn reindexing_geo(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1870,6 +1898,7 @@ fn reindexing_geo(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
@@ -1936,6 +1965,7 @@ fn deleting_geo_in_batches_default(c: &mut Criterion) {
                         None,
                         &mut new_fields_ids_map,
                         &|| false,
+                        &|_progress| (),
                     )
                     .unwrap();
 
diff --git a/crates/benchmarks/benches/utils.rs b/crates/benchmarks/benches/utils.rs
index 09a932c65..6a08b96b5 100644
--- a/crates/benchmarks/benches/utils.rs
+++ b/crates/benchmarks/benches/utils.rs
@@ -103,7 +103,15 @@ pub fn base_setup(conf: &Conf) -> Index {
 
     let indexer_alloc = Bump::new();
     let (document_changes, _operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     indexer::index(
diff --git a/crates/fuzzers/src/bin/fuzz-indexing.rs b/crates/fuzzers/src/bin/fuzz-indexing.rs
index 6b57d296f..f335938b9 100644
--- a/crates/fuzzers/src/bin/fuzz-indexing.rs
+++ b/crates/fuzzers/src/bin/fuzz-indexing.rs
@@ -128,6 +128,7 @@ fn main() {
                                     None,
                                     &mut new_fields_ids_map,
                                     &|| false,
+                                    &|_progress| (),
                                 )
                                 .unwrap();
 
diff --git a/crates/index-scheduler/src/batch.rs b/crates/index-scheduler/src/batch.rs
index 13ba70cc6..75b092b28 100644
--- a/crates/index-scheduler/src/batch.rs
+++ b/crates/index-scheduler/src/batch.rs
@@ -1344,6 +1344,7 @@ impl IndexScheduler {
                     primary_key.as_deref(),
                     &mut new_fields_ids_map,
                     &|| must_stop_processing.get(),
+                    &send_progress,
                 )?;
 
                 let mut addition = 0;
diff --git a/crates/milli/src/index.rs b/crates/milli/src/index.rs
index df30f678a..89f965b7c 100644
--- a/crates/milli/src/index.rs
+++ b/crates/milli/src/index.rs
@@ -1764,6 +1764,7 @@ pub(crate) mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )?;
 
             if let Some(error) = operation_stats.into_iter().find_map(|stat| stat.error) {
@@ -1853,6 +1854,7 @@ pub(crate) mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )?;
 
             if let Some(error) = operation_stats.into_iter().find_map(|stat| stat.error) {
@@ -1932,6 +1934,7 @@ pub(crate) mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
diff --git a/crates/milli/src/search/new/tests/integration.rs b/crates/milli/src/search/new/tests/integration.rs
index 9872acbe7..79668b34b 100644
--- a/crates/milli/src/search/new/tests/integration.rs
+++ b/crates/milli/src/search/new/tests/integration.rs
@@ -65,7 +65,15 @@ pub fn setup_search_index_with_criteria(criteria: &[Criterion]) -> Index {
 
     let indexer_alloc = Bump::new();
     let (document_changes, operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     if let Some(error) = operation_stats.into_iter().find_map(|stat| stat.error) {
diff --git a/crates/milli/src/update/index_documents/mod.rs b/crates/milli/src/update/index_documents/mod.rs
index d845d8c35..baecbdcf0 100644
--- a/crates/milli/src/update/index_documents/mod.rs
+++ b/crates/milli/src/update/index_documents/mod.rs
@@ -1947,6 +1947,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2130,6 +2131,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2190,6 +2192,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2241,6 +2244,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2291,6 +2295,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2343,6 +2348,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2400,6 +2406,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2450,6 +2457,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2500,6 +2508,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2692,6 +2701,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2749,6 +2759,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
@@ -2803,6 +2814,7 @@ mod tests {
                 None,
                 &mut new_fields_ids_map,
                 &|| false,
+                &|_progress| (),
             )
             .unwrap();
 
diff --git a/crates/milli/tests/search/facet_distribution.rs b/crates/milli/tests/search/facet_distribution.rs
index 0ec1c206f..61d0697ff 100644
--- a/crates/milli/tests/search/facet_distribution.rs
+++ b/crates/milli/tests/search/facet_distribution.rs
@@ -50,7 +50,15 @@ fn test_facet_distribution_with_no_facet_values() {
 
     let indexer_alloc = Bump::new();
     let (document_changes, _operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     indexer::index(
diff --git a/crates/milli/tests/search/mod.rs b/crates/milli/tests/search/mod.rs
index cee869a8d..1287b59d5 100644
--- a/crates/milli/tests/search/mod.rs
+++ b/crates/milli/tests/search/mod.rs
@@ -83,7 +83,15 @@ pub fn setup_search_index_with_criteria(criteria: &[Criterion]) -> Index {
 
     let indexer_alloc = Bump::new();
     let (document_changes, operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     if let Some(error) = operation_stats.into_iter().find_map(|stat| stat.error) {
diff --git a/crates/milli/tests/search/query_criteria.rs b/crates/milli/tests/search/query_criteria.rs
index 6cbf4f27d..3e56eeff0 100644
--- a/crates/milli/tests/search/query_criteria.rs
+++ b/crates/milli/tests/search/query_criteria.rs
@@ -319,7 +319,15 @@ fn criteria_ascdesc() {
     let payload = unsafe { memmap2::Mmap::map(&file).unwrap() };
     indexer.add_documents(&payload).unwrap();
     let (document_changes, _operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     indexer::index(
diff --git a/crates/milli/tests/search/typo_tolerance.rs b/crates/milli/tests/search/typo_tolerance.rs
index 5da98a680..7ac9a1e4b 100644
--- a/crates/milli/tests/search/typo_tolerance.rs
+++ b/crates/milli/tests/search/typo_tolerance.rs
@@ -128,7 +128,15 @@ fn test_typo_disabled_on_word() {
 
     let indexer_alloc = Bump::new();
     let (document_changes, _operation_stats, primary_key) = indexer
-        .into_changes(&indexer_alloc, &index, &rtxn, None, &mut new_fields_ids_map, &|| false)
+        .into_changes(
+            &indexer_alloc,
+            &index,
+            &rtxn,
+            None,
+            &mut new_fields_ids_map,
+            &|| false,
+            &|_progress| (),
+        )
         .unwrap();
 
     indexer::index(