Doc with multi-field of boolean type fails during creation

Elastic Stack Elasticsearch
1

In v5.5, we had the following mapping which was working fine

PUT multiple_datatypes
{
  "mappings": {
    "_doc": {
      "properties": {
        "user_data": {
          "type": "text",
          "fields": {
            "numeric": {
              "type": "double",
              "ignore_malformed": true
            },
            "date": {
              "type": "date",
              "ignore_malformed": true
            }
            "logical": {
              "type": "boolean",
             }
          }
        }
      }
    }
  }
In 6.2, the same mapping fails with the error  
HTTP/1.1 400 Bad Request]\n{\"error\":{\"root_cause\":[{\"type\":\"mapper_parsing_exception\",\"reason\":\"failed to parse [user_data.logical]\"}],\"type\":\"mapper_parsing_exception\",\"reason\":\"failed to parse [user_data.logical]\",\"caused_by\":{\"type\":\"illegal_argument_exception\",\"reason\":\"Failed to parse value [auto_directorUrl] as only [true] or [false] are 
 
The input data was a string, "auto_directorURL" and it failed. The ignore_malformed flag is not available for boolean types. However, this worked in 
v5.5. I find that in v6.2, ES has strictly enforced boolean type values as 'true' or 'false'. but this fails in multi-fields as it does not have a ignore_malformed flag.
what is the solution for this? Is this a BWC break and a bug
2

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