Fixes hasAnyValue() to check both keyword and text field variants

[cmgrote]

Note

Fixes value-existence check for keyword/text fields

• Overrides KeywordTextField.hasAnyValue() to should-combine exists on both keyword and text fields with minimumShouldMatch("1"), ensuring a hit if either field is populated (covers ES keyword length truncation).
• Adds required imports for BoolQuery and ExistsQuery.

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