In QueryString cannot use [fields] parameter in conjunction with [default_field] #1352
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In QueryString cannot use anymore [fields] parameter in conjunction with [default_field]. There was a test failing because of an exception : QueryValidationException
After having a look a the docs on Es6 Breaking changes I did not find anything reporting this BC, the only way to check it is having a look at Elasticsearch 6.0+ source code.
Inside QueryStringQueryBuilderTests.java there a new test testDefaultFieldsWithFields which checks exactly if both parameters are set and in case raise a QueryValidationException.
I also implement a test to check for that Exception.