Embedded ElasticSearch is not indexing all edge properties

[kfoss]

After creating indices for edge properties, embedded ElasticSearch does not index all fields. Instead, only some fields are indexed.

Example of ES not storing the "_label" property in an established index:

Titan Edge (multiple properties):

         {
            "weight": {
                "type": "string",
                "value": "0.20000000298023224"
            },
            "_edgeId": {
                "type": "string",
                "value": "4V-g-2a"
            },
            "_id": "4V-g-2a",
            "_type": "edge",
            "_outV": 16,
            "_inV": 4,
            "_label": "created"
        }

ES index for edges ("_label" index exists):

    "edge": {
        "properties": {
            "_edgeId": {
                "type": "string"
            },
            "_label": {
                "type": "string",
                "index": "not_analyzed",
                "omit_norms": true,
                "index_options": "docs"
            },
            "weight": {
                "type": "string",
                "index": "not_analyzed",
                "omit_norms": true,
                "index_options": "docs"
            }
        }
    }

ES search result ("_label" property not stored):

{
      "_index" : "dendrite-dev-8",
      "_type" : "edge",
      "_id" : "4V-g-2a",
      "_score" : 1.0, "_source" : {"weight":"0.20000000298023224","_edgeId":"4V-g-2a"}
    }