Add skip_merge option for FTS indexes

nodejs/lancedb/indices.ts

@@ -558,6 +558,12 @@ export interface FtsOptions {
    * whether to only index the prefix of the token for ngram tokenizer
    */
   prefixOnly?: boolean;
+
+  /**
+   * Whether to skip the partition merge stage after indexing.
+   * Useful for distributed indexing where merges are handled separately.
+   */
+  skipMerge?: boolean;
 }
 
 export class Index {
@@ -726,6 +732,7 @@ export class Index {
         options?.ngramMinLength,
         options?.ngramMaxLength,
         options?.prefixOnly,
+        options?.skipMerge,
       ),
     );
   }

nodejs/src/index.rs

@@ -157,6 +157,7 @@ impl Index {
         ngram_min_length: Option<u32>,
         ngram_max_length: Option<u32>,
         prefix_only: Option<bool>,
+        skip_merge: Option<bool>,
     ) -> Self {
         let mut opts = FtsIndexBuilder::default();
         if let Some(with_position) = with_position {
@@ -192,6 +193,9 @@ impl Index {
         if let Some(prefix_only) = prefix_only {
             opts = opts.ngram_prefix_only(prefix_only);
         }
+        if let Some(skip_merge) = skip_merge {
+            opts = opts.skip_merge(skip_merge);
+        }
 
         Self {
             inner: Mutex::new(Some(LanceDbIndex::FTS(opts))),