Elasticsearch error: Fielddata is disabled on text fields by default

[sahere37 (LR)]

hi all,
I have a field as PFiled which its format is as following:
1398-04-14
it is not a date field, but elasticsearch defined its mapping as date which is wrong. I define template to set it as text as following:

PUT _template/template1
{
"index_patterns" : [
   "index1*"
   ],
"mappings" : {
      "doc" : {
        "properties" : {
          "PField" : {
            "type" : "text",
            "fields" : {
              "keyword" : {
                "type" : "keyword",
                "ignore_above" : 256
              }
            }          }

}
}
}
}

running above command in dev tools, leads to following error:

failed to execute fetch phase
org.elasticsearch.transport.RemoteTransportException: [node-SRV123][localhost:9300][indices:data/read/search[phase/fetch/id]]
Caused by: java.lang.IllegalArgumentException: Fielddata is disabled on text fields by default. Set fielddata=true on [PField] 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.

there are many other text fields which elasticsearch defined them as text by default; there is no issue in the case of that fields, but when i defined PField as a text field this message has been found in the log. how can i handle this issue? this field cannot be configured as Date because it is not Date and defining text type leads to above error. could you please advise me about this?

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