[[geohash-prefix]] === `geohash_prefix` Geohashes are a form of lat/lon encoding which divides the earth up into a grid. Each cell in this grid is represented by a geohash string. Each cell in turn can be further subdivided into smaller cells which are represented by a longer string. So the longer the geohash, the smaller (and thus more accurate) the cell is. While the <> option enables indexing the geohash that corresponds to the lat/lon point, at the specified <>, the `geohash_prefix` option will also index all the enclosing cells as well. For instance, a geohash of `drm3btev3e86` will index all of the following terms: [ `d`, `dr`, `drm`, `drm3`, `drm3b`, `drm3bt`, `drm3bte`, `drm3btev`, `drm3btev3`, `drm3btev3e`, `drm3btev3e8`, `drm3btev3e86` ]. The geohash prefixes can be used with the <> to find points within a particular geohash, or its neighbours: [source,js] -------------------------------------------------- PUT my_index { "mappings": { "my_type": { "properties": { "location": { "type": "geo_point", "geohash_prefix": true, "geohash_precision": 6 } } } } } PUT my_index/my_type/1 { "location": { "lat": 41.12, "lon": -71.34 } } GET my_index/_search?fielddata_fields=location.geohash { "query": { "geohash_cell": { "location": { "lat": 41.02, "lon": -71.48 }, "precision": 4, <1> "neighbors": true <1> } } } -------------------------------------------------- // CONSOLE