Neptune FTS BadRequestException Error

Hi All, While trying to use federated query for FTS, i am getting

{
  "code": "BadRequestException",
  "detailedMessage": "An IOException happened while fetching data from ES",
  "requestId": "xxx-xxxx-xxxx-xxxx"
}

The Query looks very simple-

PREFIX neptune-fts: <http://aws.amazon.com/neptune/vocab/v01/services/fts#>
SELECT * WHERE {
  SERVICE neptune-fts:search {
    neptune-fts:config neptune-fts:endpoint 'Elasticsearch Endpint' .
    neptune-fts:config neptune-fts:queryType 'match' .
    neptune-fts:config neptune-fts:field '*' .
    neptune-fts:config neptune-fts:query 'naruto' .
    neptune-fts:config neptune-fts:return ?res.
    }
  }