Accessing inline fields of es json response

Hi All,

I am new to Elasticsearch, could any one please help me on getting the value of a particular of below format,

"_source": {
"Identification": {
"DUNS_NBR": "12345678",
"GEO_REF_ID": "34567",
"GSRL_DT": "2017-08-22T15:24:46.000000",
"INFO_SRC_CD": 20008,
"REC_TYP_CD": 11592

Above provided piece of json is from elasticsearch response. through script fields functionality i have to get INFO_SRC_CD and REC_TYP_CD values. when i am trying to do in below way,

"script_fields" : {
"test1" : {
"script" : {
"lang": "painless",
"source": "doc['Identification.PAYL_HDR.INFO_SRC_CD'].value + doc['Identification.PAYL_HDR.REC_TYP_CD'].value"

I am getting below error,
Fielddata is disabled on text fields by default. Set fielddata=true on [Identification.PAYL_HDR.INFO_SRC_CD] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory. Alternatively use a keyword field instead.

Could you please help me out on how to solve this issue.


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