Remove default_field from query:queryString:options #18966
Merged
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Fixes #16232
Fixes #15863
In 7.0 ES added a limit to the number of fields that can be queried. In 6.0 we started using default_field: * to get consistent highlighting in Discover even when a user had a mix of indices with and without an _all field. This is causing an issue with Beats pre-defined dashboards because the number of fields in a Beats index surpasses the query limit, yet we're telling it to query all fields. In 7.0, the _all field will be completely gone so we no longer really need the default_field setting. Let's remove it in 7.0.