Support Elasticsearch geolocation filtering operators using NXQL hints

A string field that contains a geolocation of the following format:

• "41.12,-71.34": latitude and longitude
• "drm3btev3e86": geohash
  can be indexed and filtered by Elasticsearch if the proper mapping is defined.

Here the list of filter that can be supported via NXQL hints:

• geo_bounding location in a bounding box, first param is top_left then bottom_right point

  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_bounding_box) */ osm:location IN ('40.73, -74.1', '40.01, -71.12')
  

• geo_distance location inside a circle, much slower than bounding box

  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_distance) */ osm:location IN ('40.73, -74.1', '200km')
  

• geo_distance_range location between 200km and 400km, slow

  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_distance_range) */ osm:location IN ('40.73, -74.1', '200km', '400km')
  

• geo_hash_cell location near a point using geohash
  here level 5 precision is ~5kmx5km, fast operation

  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_hash_cell) */ osm:location IN ('40.73, -74.1', '5')
  -- location can use geohash instead of latitude longitude
  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_hash_cell) */ osm:location IN ('drm3btev3e86', '5')
  

• geo_shape location inside a shape, the shape must be defined in an other ES index

  SELECT * FROM Document WHERE /*+ES: OPERATOR(geo_shape) */ osm:location IN ('FRA', 'countries', 'shapes', 'location');