diff --git a/milli/src/update/index_documents/extract/extract_docid_word_positions.rs b/milli/src/update/index_documents/extract/extract_docid_word_positions.rs
index eb6e9768f..925ca2d10 100644
--- a/milli/src/update/index_documents/extract/extract_docid_word_positions.rs
+++ b/milli/src/update/index_documents/extract/extract_docid_word_positions.rs
@@ -13,7 +13,7 @@ use crate::error::{InternalError, SerializationError};
 use crate::update::del_add::{del_add_from_two_obkvs, DelAdd, KvReaderDelAdd};
 use crate::{FieldId, Result, MAX_POSITION_PER_ATTRIBUTE, MAX_WORD_LENGTH};
 
-pub type ScriptLanguageDocidsMap = HashMap<(Script, Language), RoaringBitmap>;
+pub type ScriptLanguageDocidsMap = HashMap<(Script, Language), (RoaringBitmap, RoaringBitmap)>;
 
 /// Extracts the word and positions where this word appear and
 /// prefixes it by the document id.
@@ -29,8 +29,7 @@ pub fn extract_docid_word_positions<R: io::Read + io::Seek>(
     allowed_separators: Option<&[&str]>,
     dictionary: Option<&[&str]>,
     max_positions_per_attributes: Option<u32>,
-) -> Result<(RoaringBitmap, grenad::Reader<File>, (ScriptLanguageDocidsMap, ScriptLanguageDocidsMap))>
-{
+) -> Result<(RoaringBitmap, grenad::Reader<File>, ScriptLanguageDocidsMap)> {
     puffin::profile_function!();
 
     let max_positions_per_attributes = max_positions_per_attributes
@@ -39,8 +38,7 @@ pub fn extract_docid_word_positions<R: io::Read + io::Seek>(
 
     // initialize destination values.
     let mut documents_ids = RoaringBitmap::new();
-    let mut del_script_language_docids = HashMap::new();
-    let mut add_script_language_docids = HashMap::new();
+    let mut script_language_docids = HashMap::new();
     let mut docid_word_positions_sorter = create_sorter(
         grenad::SortAlgorithm::Stable,
         keep_latest_obkv,
@@ -134,25 +132,24 @@ pub fn extract_docid_word_positions<R: io::Read + io::Seek>(
         // update script_language_docids deletions.
         for (script, languages_frequency) in del_script_language_word_count {
             for (language, _) in languages_frequency {
-                let entry = del_script_language_docids
+                let entry = script_language_docids
                     .entry((script, language))
-                    .or_insert_with(RoaringBitmap::new);
-                entry.push(document_id);
+                    .or_insert_with(|| (RoaringBitmap::new(), RoaringBitmap::new()));
+                entry.0.push(document_id);
             }
         }
 
         // update script_language_docids additions.
         for (script, languages_frequency) in add_script_language_word_count {
             for (language, _) in languages_frequency {
-                let entry = add_script_language_docids
+                let entry = script_language_docids
                     .entry((script, language))
-                    .or_insert_with(RoaringBitmap::new);
-                entry.push(document_id);
+                    .or_insert_with(|| (RoaringBitmap::new(), RoaringBitmap::new()));
+                entry.1.push(document_id);
             }
         }
     }
 
-    let script_language_docids = (del_script_language_docids, add_script_language_docids);
     sorter_into_reader(docid_word_positions_sorter, indexer)
         .map(|reader| (documents_ids, reader, script_language_docids))
 }
diff --git a/milli/src/update/index_documents/typed_chunk.rs b/milli/src/update/index_documents/typed_chunk.rs
index 3d78e6235..c83769fb5 100644
--- a/milli/src/update/index_documents/typed_chunk.rs
+++ b/milli/src/update/index_documents/typed_chunk.rs
@@ -43,9 +43,7 @@ pub(crate) enum TypedChunk {
     FieldIdFacetIsEmptyDocids(grenad::Reader<File>),
     GeoPoints(grenad::Reader<File>),
     VectorPoints(grenad::Reader<File>),
-    ScriptLanguageDocids(
-        (HashMap<(Script, Language), RoaringBitmap>, HashMap<(Script, Language), RoaringBitmap>),
-    ),
+    ScriptLanguageDocids(HashMap<(Script, Language), (RoaringBitmap, RoaringBitmap)>),
 }
 
 impl TypedChunk {
@@ -103,8 +101,8 @@ impl TypedChunk {
             TypedChunk::VectorPoints(grenad) => {
                 format!("VectorPoints {{ number_of_entries: {} }}", grenad.len())
             }
-            TypedChunk::ScriptLanguageDocids((_, addition)) => {
-                format!("ScriptLanguageDocids {{ number_of_entries: {} }}", addition.len())
+            TypedChunk::ScriptLanguageDocids(sl_map) => {
+                format!("ScriptLanguageDocids {{ number_of_entries: {} }}", sl_map.len())
             }
         }
     }
@@ -346,24 +344,25 @@ pub(crate) fn write_typed_chunk_into_index(
             log::debug!("There are {} entries in the HNSW so far", hnsw_length);
             index.put_vector_hnsw(wtxn, &new_hnsw)?;
         }
-        TypedChunk::ScriptLanguageDocids((deletion, addition)) => {
-            for (key, value) in deletion {
-                if let Some(mut db_values) = index.script_language_docids.get(wtxn, &key)? {
-                    db_values -= value;
-                    if db_values.is_empty() {
-                        index.script_language_docids.delete(wtxn, &key)?;
-                    } else {
-                        index.script_language_docids.put(wtxn, &key, &db_values)?;
-                    }
-                }
-            }
-
-            for (key, value) in addition {
+        TypedChunk::ScriptLanguageDocids(sl_map) => {
+            for (key, (deletion, addition)) in sl_map {
+                let mut db_key_exists = false;
                 let final_value = match index.script_language_docids.get(wtxn, &key)? {
-                    Some(mut db_values) => db_values | value,
-                    None => value,
+                    Some(db_values) => {
+                        db_key_exists = true;
+                        (db_values - deletion) | addition
+                    }
+                    None => addition,
                 };
-                index.script_language_docids.put(wtxn, &key, &final_value)?;
+
+                if final_value.is_empty() {
+                    // If the database entry exists, delete it.
+                    if db_key_exists == true {
+                        index.script_language_docids.delete(wtxn, &key)?;
+                    }
+                } else {
+                    index.script_language_docids.put(wtxn, &key, &final_value)?;
+                }
             }
         }
     }
@@ -388,13 +387,6 @@ fn merge_word_docids_reader_into_fst(
     Ok(builder.into_set())
 }
 
-fn merge_roaring_bitmaps(new_value: &[u8], db_value: &[u8], buffer: &mut Vec<u8>) -> Result<()> {
-    let new_value = RoaringBitmap::deserialize_from(new_value)?;
-    let db_value = RoaringBitmap::deserialize_from(db_value)?;
-    let value = new_value | db_value;
-    Ok(serialize_roaring_bitmap(&value, buffer)?)
-}
-
 fn merge_cbo_roaring_bitmaps(
     new_value: &[u8],
     db_value: &[u8],