feat: add async and sync hybrid search index creation methods

Author: JHSeo-git

langchain_postgres/v2/vectorstores.py

@@ -789,6 +789,20 @@ def max_marginal_relevance_search_with_score_by_vector(
             )
         )
 
+    async def aapply_hybrid_search_index(
+        self,
+        concurrently: bool = False,
+    ) -> None:
+        """Creates a TSV index in the vector store table if possible."""
+        return await self._engine._run_as_async(self.__vs.aapply_hybrid_search_index(concurrently=concurrently))
+
+    def apply_hybrid_search_index(
+        self, 
+        concurrently: bool = False,
+    ) -> None:
+        """Creates a TSV index in the vector store table if possible."""
+        return self._engine._run_as_sync(self.__vs.aapply_hybrid_search_index(concurrently=concurrently))
+
     async def aapply_vector_index(
         self,
         index: BaseIndex,