Error when retrieving audits

[ibrunotome]

Hi, the write into elasticsearch works good, but when I try to retrieve the audits like in your readme I got this:

    "message": "{\"error\":{\"root_cause\":[{\"type\":\"illegal_argument_exception\",\"reason\":\"field name is null or empty\"}],\"type\":\"illegal_argument_exception\",\"reason\":\"field name is null or empty\"},\"status\":400}",
    "exception": "Elasticsearch\\Common\\Exceptions\\BadRequest400Exception",
    "file": "/var/www/app/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php",
    "line": 615,

This field name null or empty is on the audits driver code or something like? because my User model has a name and it goes to the elasticsearch as expected.