When you say "doesn't allow", what do you mean? Is there an error? Does the same filter work as expected in Discover? Could you post a screenshot of what you are trying to do?
In general, if you filter against non-analyzed strings syntax such as field_name:"blah.bhah" should work:
As a workaround, I renamed the field. Probably something quirky with my setup if no one else sees it. I should've captured the elasticsearch request kibana was making. Thanks for following up.
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