[DOCS] Fix typo

docs/reference/index-modules.asciidoc

@@ -326,7 +326,7 @@ The final pipeline always runs after the request pipeline (if specified) and
 the default pipeline (if it exists). The special pipeline name `_none`
 indicates no ingest pipeline will run.
 +
-NOTE: You can't use a final pipelines to change the `_index` field. If the
+NOTE: You can't use a final pipeline to change the `_index` field. If the
 pipeline attempts to change the `_index` field, the indexing request will fail.
 
 [[index-mapping-dimension-fields-limit]]