diff --git a/Cargo.lock b/Cargo.lock
index 1102873a8..8e26cc940 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -37,7 +37,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "assert-json-diff"
 version = "1.0.1"
-source = "git+https://github.com/qdequele/assert-json-diff#0340008d8fc183a490e3ccf81f86a2355a7474e7"
+source = "git+https://github.com/qdequele/assert-json-diff#29bdf99315e510abb2824ccb9353b3a7a330cbc4"
 dependencies = [
  "serde 1.0.102 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/meilisearch-core/src/settings.rs b/meilisearch-core/src/settings.rs
index 3a1687060..d3f2bf5f9 100644
--- a/meilisearch-core/src/settings.rs
+++ b/meilisearch-core/src/settings.rs
@@ -2,7 +2,7 @@ use std::sync::Mutex;
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use std::str::FromStr;
 
-use serde::{Deserialize, Serialize};
+use serde::{Deserialize, Deserializer, Serialize};
 use once_cell::sync::Lazy;
 
 static RANKING_RULE_REGEX: Lazy<Mutex<regex::Regex>> = Lazy::new(|| {
@@ -27,29 +27,7 @@ impl Into<SettingsUpdate> for Settings {
         let settings = self.clone();
 
         let ranking_rules = match settings.ranking_rules {
-            Some(rules) => {
-                let mut final_rules = Vec::new();
-                for rule in rules {
-                    let parsed_rule = match rule.as_str() {
-                        "_typo" => RankingRule::Typo,
-                        "_words" => RankingRule::Words,
-                        "_proximity" => RankingRule::Proximity,
-                        "_attribute" => RankingRule::Attribute,
-                        "_words_position" => RankingRule::WordsPosition,
-                        "_exact" => RankingRule::Exact,
-                        _ => {
-                            let captures = RANKING_RULE_REGEX.lock().unwrap().captures(&rule).unwrap();
-                            match captures[1].as_ref() {
-                                "asc" => RankingRule::Asc(captures[2].to_string()),
-                                "dsc" => RankingRule::Dsc(captures[2].to_string()),
-                                _ => continue
-                            }
-                        }
-                    };
-                    final_rules.push(parsed_rule);
-                }
-                Some(final_rules)
-            }
+            Some(rules) => Some(RankingRule::from_vec(rules)),
             None => None
         };
 
@@ -65,6 +43,46 @@ impl Into<SettingsUpdate> for Settings {
     }
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SettingsComplete {
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub ranking_rules: Option<Option<Vec<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub ranking_distinct: Option<Option<String>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub attribute_identifier: Option<Option<String>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub attributes_searchable: Option<Option<Vec<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub attributes_displayed: Option<Option<HashSet<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub stop_words: Option<Option<BTreeSet<String>>>,
+    #[serde(default, deserialize_with = "deserialize_some")]
+    pub synonyms: Option<Option<BTreeMap<String, Vec<String>>>>,
+}
+
+impl Into<SettingsUpdate> for SettingsComplete {
+    fn into(self) -> SettingsUpdate {
+        let settings = self.clone();
+
+        let ranking_rules = match settings.ranking_rules {
+            Some(Some(rules)) => Some(Some(RankingRule::from_vec(rules))),
+            Some(None) => Some(None),
+            None => None,
+        };
+
+        SettingsUpdate {
+            ranking_rules: ranking_rules.into(),
+            ranking_distinct: settings.ranking_distinct.into(),
+            attribute_identifier: settings.attribute_identifier.into(),
+            attributes_searchable: settings.attributes_searchable.into(),
+            attributes_displayed: settings.attributes_displayed.into(),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+        }
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum UpdateState<T> {
     Update(T),
@@ -83,6 +101,16 @@ impl <T> From<Option<T>> for UpdateState<T> {
     }
 }
 
+impl <T> From<Option<Option<T>>> for UpdateState<T> {
+    fn from(opt: Option<Option<T>>) -> UpdateState<T> {
+        match opt {
+            Some(Some(t)) => UpdateState::Update(t),
+            Some(None) => UpdateState::Clear,
+            None => UpdateState::Nothing,
+        }
+    }
+}
+
 impl<T> UpdateState<T> {
     pub fn is_changed(&self) -> bool {
         match self {
@@ -128,15 +156,6 @@ impl ToString for RankingRule {
     }
 }
 
-impl RankingRule {
-    pub fn get_field(&self) -> Option<String> {
-        match self {
-            RankingRule::Asc(field) | RankingRule::Dsc(field) => Some((*field).clone()),
-            _ => None,
-        }
-    }
-}
-
 impl FromStr for RankingRule {
     type Err = RankingRuleConversionError;
 
@@ -161,6 +180,22 @@ impl FromStr for RankingRule {
     }
 }
 
+impl RankingRule {
+    pub fn get_field(&self) -> Option<String> {
+        match self {
+            RankingRule::Asc(field) | RankingRule::Dsc(field) => Some((*field).clone()),
+            _ => None,
+        }
+    }
+
+    pub fn from_vec(rules: Vec<String>) -> Vec<RankingRule> {
+        rules.iter()
+            .map(|s| RankingRule::from_str(s.as_str()))
+            .filter_map(Result::ok)
+            .collect()
+    }
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SettingsUpdate {
     pub ranking_rules: UpdateState<Vec<RankingRule>>,
@@ -185,3 +220,11 @@ impl Default for SettingsUpdate {
         }
     }
 }
+
+// Any value that is present is considered Some value, including null.
+fn deserialize_some<'de, T, D>(deserializer: D) -> Result<Option<T>, D::Error>
+    where T: Deserialize<'de>,
+          D: Deserializer<'de>
+{
+    Deserialize::deserialize(deserializer).map(Some)
+}
diff --git a/meilisearch-http/src/routes/setting.rs b/meilisearch-http/src/routes/setting.rs
index b5a25635d..b001b8fc9 100644
--- a/meilisearch-http/src/routes/setting.rs
+++ b/meilisearch-http/src/routes/setting.rs
@@ -1,7 +1,7 @@
 use std::collections::{BTreeMap, BTreeSet, HashSet};
 use serde::{Deserialize, Serialize};
 use tide::{Request, Response};
-use meilisearch_core::settings::{SettingsUpdate, UpdateState, Settings};
+use meilisearch_core::settings::{SettingsUpdate, UpdateState, Settings, SettingsComplete};
 
 use crate::error::{ResponseError, SResult};
 use crate::helpers::tide::RequestExt;
@@ -77,7 +77,7 @@ pub async fn get_all(ctx: Request<Data>) -> SResult<Response> {
 pub async fn update_all(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: Settings = ctx.body_json().await.map_err(ResponseError::bad_request)?;
+    let settings: SettingsComplete = ctx.body_json().await.map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
     let mut writer = db.update_write_txn()?;
@@ -113,7 +113,7 @@ pub async fn delete_all(ctx: Request<Data>) -> SResult<Response> {
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
-pub struct RankingSettings {
+pub struct GetRankingSettings {
     pub ranking_rules: Option<Vec<String>>,
     pub ranking_distinct: Option<String>,
 }
@@ -132,7 +132,7 @@ pub async fn get_ranking(ctx: Request<Data>) -> SResult<Response> {
     };
 
     let ranking_distinct = index.main.ranking_distinct(&reader)?;
-    let settings = RankingSettings {
+    let settings = GetRankingSettings {
         ranking_rules,
         ranking_distinct,
     };
@@ -140,16 +140,22 @@ pub async fn get_ranking(ctx: Request<Data>) -> SResult<Response> {
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SetRankingSettings {
+    pub ranking_rules: Option<Option<Vec<String>>>,
+    pub ranking_distinct: Option<Option<String>>,
+}
+
 pub async fn update_ranking(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: RankingSettings = ctx.body_json().await.map_err(ResponseError::bad_request)?;
+    let settings: SetRankingSettings = ctx.body_json().await.map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
+    let settings = SettingsComplete {
         ranking_rules: settings.ranking_rules,
         ranking_distinct: settings.ranking_distinct,
-        .. Settings::default()
+        .. SettingsComplete::default()
     };
 
     let mut writer = db.update_write_txn()?;
@@ -181,7 +187,7 @@ pub async fn delete_ranking(ctx: Request<Data>) -> SResult<Response> {
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
-pub struct RankingRulesSettings {
+pub struct GetRankingRulesSettings {
     pub ranking_rules: Option<Vec<String>>,
 }
 
@@ -198,23 +204,28 @@ pub async fn get_rules(ctx: Request<Data>) -> SResult<Response> {
         None => None,
     };
 
-    let settings = RankingRulesSettings {
+    let settings = GetRankingRulesSettings {
         ranking_rules,
     };
 
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SetRankingRulesSettings {
+    pub ranking_rules: Option<Option<Vec<String>>>,
+}
+
 pub async fn update_rules(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: RankingRulesSettings = ctx.body_json().await
+    let settings: SetRankingRulesSettings = ctx.body_json().await
         .map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
+    let settings = SettingsComplete {
         ranking_rules: settings.ranking_rules,
-        .. Settings::default()
+        .. SettingsComplete::default()
     };
 
     let mut writer = db.update_write_txn()?;
@@ -245,7 +256,7 @@ pub async fn delete_rules(ctx: Request<Data>) -> SResult<Response> {
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
-pub struct RankingDistinctSettings {
+pub struct GetRankingDistinctSettings {
     pub ranking_distinct: Option<String>,
 }
 
@@ -256,23 +267,28 @@ pub async fn get_distinct(ctx: Request<Data>) -> SResult<Response> {
     let reader = db.main_read_txn()?;
 
     let ranking_distinct = index.main.ranking_distinct(&reader)?;
-    let settings = RankingDistinctSettings {
+    let settings = GetRankingDistinctSettings {
         ranking_distinct,
     };
 
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SetRankingDistinctSettings {
+    pub ranking_distinct: Option<Option<String>>,
+}
+
 pub async fn update_distinct(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: RankingDistinctSettings = ctx.body_json().await
+    let settings: SetRankingDistinctSettings = ctx.body_json().await
         .map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
+    let settings = SettingsComplete {
         ranking_distinct: settings.ranking_distinct,
-        .. Settings::default()
+        .. SettingsComplete::default()
     };
 
     let mut writer = db.update_write_txn()?;
@@ -303,7 +319,7 @@ pub async fn delete_distinct(ctx: Request<Data>) -> SResult<Response> {
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
-pub struct AttributesSettings {
+pub struct GetAttributesSettings {
     pub attribute_identifier: Option<String>,
     pub attributes_searchable: Option<Vec<String>>,
     pub attributes_displayed: Option<HashSet<String>>,
@@ -321,7 +337,7 @@ pub async fn get_attributes(ctx: Request<Data>) -> SResult<Response> {
     let attributes_searchable = schema.clone().map(|s| s.get_indexed_name());
     let attributes_displayed = schema.clone().map(|s| s.get_displayed_name());
 
-    let settings = AttributesSettings {
+    let settings = GetAttributesSettings {
         attribute_identifier,
         attributes_searchable,
         attributes_displayed,
@@ -330,18 +346,25 @@ pub async fn get_attributes(ctx: Request<Data>) -> SResult<Response> {
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SetAttributesSettings {
+    pub attribute_identifier: Option<Option<String>>,
+    pub attributes_searchable: Option<Option<Vec<String>>>,
+    pub attributes_displayed: Option<Option<HashSet<String>>>,
+}
+
 pub async fn update_attributes(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: AttributesSettings = ctx.body_json().await
+    let settings: SetAttributesSettings = ctx.body_json().await
         .map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
+    let settings = SettingsComplete {
         attribute_identifier: settings.attribute_identifier,
         attributes_searchable: settings.attributes_searchable,
         attributes_displayed: settings.attributes_displayed,
-        .. Settings::default()
+        .. SettingsComplete::default()
     };
 
     let mut writer = db.update_write_txn()?;
@@ -394,7 +417,7 @@ pub async fn get_identifier(ctx: Request<Data>) -> SResult<Response> {
 }
 
 #[derive(Default, Clone, Serialize, Deserialize)]
-pub struct AttributesSearchableSettings {
+pub struct GetAttributesSearchableSettings {
     pub attributes_searchable: Option<Vec<String>>,
 }
 
@@ -408,23 +431,28 @@ pub async fn get_searchable(ctx: Request<Data>) -> SResult<Response> {
 
     let attributes_searchable = schema.map(|s| s.get_indexed_name());
 
-    let settings = AttributesSearchableSettings {
+    let settings = GetAttributesSearchableSettings {
         attributes_searchable,
     };
 
     Ok(tide::Response::new(200).body_json(&settings).unwrap())
 }
 
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct SetAttributesSearchableSettings {
+    pub attributes_searchable: Option<Option<Vec<String>>>,
+}
+
 pub async fn update_searchable(mut ctx: Request<Data>) -> SResult<Response> {
     ctx.is_allowed(SettingsWrite)?;
     let index = ctx.index()?;
-    let settings: AttributesSearchableSettings = ctx.body_json().await
+    let settings: SetAttributesSearchableSettings = ctx.body_json().await
         .map_err(ResponseError::bad_request)?;
     let db = &ctx.state().db;
 
-    let settings = Settings {
+    let settings = SettingsComplete {
         attributes_searchable: settings.attributes_searchable,
-        .. Settings::default()
+        .. SettingsComplete::default()
     };
 
     let mut writer = db.update_write_txn()?;
diff --git a/meilisearch-http/tests/settings.rs b/meilisearch-http/tests/settings.rs
index 7646be40d..095220813 100644
--- a/meilisearch-http/tests/settings.rs
+++ b/meilisearch-http/tests/settings.rs
@@ -11,7 +11,7 @@ use assert_json_diff::assert_json_eq;
 mod common;
 
 #[test]
-fn write_all_and_retreive() {
+fn write_all_and_delete() {
     let mut server = common::setup_server().unwrap();
 
     // 1 - Create the index
@@ -55,10 +55,6 @@ fn write_all_and_retreive() {
             "release_date",
             "rank",
         ],
-        "attributes_ranked": [
-            "release_date",
-            "rank",
-        ],
         "stop_words": [
             "the",
             "a",
@@ -114,10 +110,173 @@ fn write_all_and_retreive() {
         "attribute_identifier": null,
         "attributes_searchable": null,
         "attributes_displayed": null,
-        "attributes_ranked": null,
         "stop_words": null,
         "synonyms": null,
     });
 
     assert_json_eq!(json, res_value, ordered: false);
 }
+
+
+#[test]
+fn write_all_and_update() {
+    let mut server = common::setup_server().unwrap();
+
+    // 1 - Create the index
+
+    let body = json!({
+        "uid": "movies",
+    }).to_string().into_bytes();
+
+    let req = http::Request::post("/indexes").body(Body::from(body)).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 201);
+
+    // 2 - Send the settings
+
+    let json = json!({
+        "ranking_rules": [
+            "_typo",
+            "_words",
+            "_proximity",
+            "_attribute",
+            "_words_position",
+            "_exact",
+            "dsc(release_date)",
+            "dsc(rank)",
+        ],
+        "ranking_distinct": "movie_id",
+        "attribute_identifier": "uid",
+        "attributes_searchable": [
+            "uid",
+            "movie_id",
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ],
+        "attributes_displayed": [
+            "title",
+            "description",
+            "poster",
+            "release_date",
+            "rank",
+        ],
+        "stop_words": [
+            "the",
+            "a",
+            "an",
+        ],
+        "synonyms": {
+            "wolverine": ["xmen", "logan"],
+            "logan": ["wolverine"],
+        }
+    });
+
+    let body = json.to_string().into_bytes();
+
+    let req = http::Request::post("/indexes/movies/settings").body(Body::from(body)).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 202);
+
+    block_on(sleep(Duration::from_secs(1)));
+
+    // 3 - Get all settings and compare to the previous one
+
+    let req = http::Request::get("/indexes/movies/settings").body(Body::empty()).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 200);
+
+    let mut buf = Vec::new();
+    block_on(res.into_body().read_to_end(&mut buf)).unwrap();
+    let res_value: Value = serde_json::from_slice(&buf).unwrap();
+
+    assert_json_eq!(json, res_value, ordered: false);
+
+    // 4 - Update all settings
+
+    let json_update = json!({
+        "ranking_rules": [
+            "_typo",
+            "_words",
+            "_proximity",
+            "_attribute",
+            "_words_position",
+            "_exact",
+            "dsc(release_date)",
+        ],
+        "ranking_distinct": null,
+        "attribute_identifier": "uid",
+        "attributes_searchable": [
+            "title",
+            "description",
+            "uid",
+        ],
+        "attributes_displayed": [
+            "title",
+            "description",
+            "release_date",
+            "rank",
+            "poster",
+        ],
+        "stop_words": [
+        ],
+        "synonyms": {
+            "wolverine": ["xmen", "logan"],
+            "logan": ["wolverine", "xmen"],
+        }
+    });
+
+    let body_update = json_update.to_string().into_bytes();
+
+    let req = http::Request::post("/indexes/movies/settings").body(Body::from(body_update)).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 202);
+
+    block_on(sleep(Duration::from_secs(1)));
+
+    // 5 - Get all settings and check if the content is the same of (4)
+
+    let req = http::Request::get("/indexes/movies/settings").body(Body::empty()).unwrap();
+    let res = server.simulate(req).unwrap();
+    assert_eq!(res.status(), 200);
+
+    let mut buf = Vec::new();
+    block_on(res.into_body().read_to_end(&mut buf)).unwrap();
+    let res_value: Value = serde_json::from_slice(&buf).unwrap();
+
+    let res_expected = json!({
+        "ranking_rules": [
+            "_typo",
+            "_words",
+            "_proximity",
+            "_attribute",
+            "_words_position",
+            "_exact",
+            "dsc(release_date)",
+        ],
+        "ranking_distinct": "movie_id",
+        "attribute_identifier": "uid",
+        "attributes_searchable": [
+            "title",
+            "description",
+            "uid",
+        ],
+        "attributes_displayed": [
+            "title",
+            "description",
+            "release_date",
+            "rank",
+            "poster",
+        ],
+        "stop_words": [
+        ],
+        "synonyms": {
+            "wolverine": ["xmen", "logan"],
+            "logan": ["wolverine", "xmen"],
+        }
+    });
+
+    assert_json_eq!(json_update, res_value, ordered: false);
+}