Elastic search wrapper query not works with base64 encoded string

elastic search wrapper query not works with base64 encoded string
ES version : 5.2.3

curl -XPOST 'http://localhost:9200/entitymaster_qa_t4/_search' -d '{
"query" : {
"wrapper" : {
"query" : "W0NAMTZiN2MzYw=="
}
}
}'

Reponse:

{

"error": {

"root_cause": [

{

"type": "parse_exception",

"reason": "Failed to derive xcontent"

}

],

"type": "search_phase_execution_exception",

"reason": "all shards failed",

"phase": "query",

"grouped": true,

"failed_shards": [

{

"shard": 0,

"index": "entitymaster_qa_t4",

"node": "8WVaVr9ATmaqOPDHGpNyHw",

"reason": {

"type": "parse_exception",

"reason": "Failed to derive xcontent"

}

}

],

},

"status": 400

}

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