ActionRequestValidationException[Validation Failed: 1: script or doc is missing;] for following UPDATE command in javascript API ElasticSearch 1.4

CLIENT_INSTANCE.update({
index: INDEX_NAME,
type: INDEX_TYPE,
id: RECORD_ID,
body: {
RECORD_KEY: RECORD_NEW_VALUE,
}
}, function (error, response) {
console.log(response);
}
);

DEBUG: 2014-11-17T11:30:29Z
starting request { method: 'POST',
path: '/robot-index/tags/0/_update',
body: { tags:
'{Important:FF0000,Assigned:FF9933,Resolved:33CC33,newTag:89da3a}' },
query: {} }

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