langchain

4364d331 - Add custom vector fields and text fields for OpenSearch (#2652)

Add custom vector fields and text fields for OpenSearch (#2652) **Description** Add custom vector field name and text field name while indexing and querying for OpenSearch **Issues** https://github.com/hwchase17/langchain/issues/2500 Signed-off-by: Naveen Tatikonda <navtat@amazon.com>