Remove .geohash suffix from GeoDistanceQuery and GeoDistanceRangeQuery #15871
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Occasionally the .geohash suffix in Geo{Distance|DistanceRange}Query would conflict with a mapping that defines a sub-field by the same name. This occurs often with nested and multi-fields when a mapping defines a geo_point sub-field using the field name "geohash". Since the QueryParser already handles parsing geohash encoded geopoints, without requiring the ".geohash" suffix, the suffix parsing can be removed altogether.
This PR removes the .geohash suffix parsing, adds explicit test coverage for the nested query use-case, and adds random distance queries to the nested query test suite.
closes #15179