Move geo-grid functions out of SNAPSHOT and into tech-preview (#134228)

The PR at #129581 added
three new types: `geohash`, `geotile` and `geohex`, and support
functions for creating these from strings, longs and geo_point fields.
However all this was done under SNAPSHOT. Now it's time to move it into
`tech-preview`.

Author: craigtaverner

docs/reference/query-languages/esql/_snippets/functions/description/st_geohash.md

@@ -10,3 +10,6 @@
   * [preview] [`ST_XMIN`](../../functions-operators/spatial-functions.md#esql-st_xmin)
   * [preview] [`ST_YMAX`](../../functions-operators/spatial-functions.md#esql-st_ymax)
   * [preview] [`ST_YMIN`](../../functions-operators/spatial-functions.md#esql-st_ymin)
+* [preview] [`ST_GEOTILE`](../../functions-operators/spatial-functions.md#esql-st_geotile)
+* [preview] [`ST_GEOHEX`](../../functions-operators/spatial-functions.md#esql-st_geohex)
+* [preview] [`ST_GEOHASH`](../../functions-operators/spatial-functions.md#esql-st_geohash)

docs/reference/query-languages/esql/_snippets/functions/description/st_geohex.md

@@ -6,8 +6,11 @@
 * [`TO_DATE_NANOS`](../../functions-operators/type-conversion-functions.md#esql-to_date_nanos)
 * [`TO_DEGREES`](../../functions-operators/type-conversion-functions.md#esql-to_degrees)
 * [`TO_DOUBLE`](../../functions-operators/type-conversion-functions.md#esql-to_double)
+* [preview] [`TO_GEOHASH`](../../functions-operators/type-conversion-functions.md#esql-to_geohash)
+* [preview] [`TO_GEOHEX`](../../functions-operators/type-conversion-functions.md#esql-to_geohex)
 * [`TO_GEOPOINT`](../../functions-operators/type-conversion-functions.md#esql-to_geopoint)
 * [`TO_GEOSHAPE`](../../functions-operators/type-conversion-functions.md#esql-to_geoshape)
+* [preview] [`TO_GEOTILE`](../../functions-operators/type-conversion-functions.md#esql-to_geotile)
 * [`TO_INTEGER`](../../functions-operators/type-conversion-functions.md#esql-to_integer)
 * [`TO_IP`](../../functions-operators/type-conversion-functions.md#esql-to_ip)
 * [`TO_LONG`](../../functions-operators/type-conversion-functions.md#esql-to_long)

docs/reference/query-languages/esql/_snippets/functions/description/st_geotile.md

@@ -47,3 +47,12 @@ mapped_pages:
 
 :::{include} ../_snippets/functions/layout/st_ymin.md
 :::
+
+:::{include} ../_snippets/functions/layout/st_geotile.md
+:::
+
+:::{include} ../_snippets/functions/layout/st_geohex.md
+:::
+
+:::{include} ../_snippets/functions/layout/st_geohash.md
+:::

docs/reference/query-languages/esql/_snippets/functions/description/to_geohash.md

@@ -43,12 +43,21 @@ mapped_pages:
 :::{include} ../_snippets/functions/layout/to_double.md
 :::
 
+:::{include} ../_snippets/functions/layout/to_geohash.md
+:::
+
+:::{include} ../_snippets/functions/layout/to_geohex.md
+:::
+
 :::{include} ../_snippets/functions/layout/to_geopoint.md
 :::
 
 :::{include} ../_snippets/functions/layout/to_geoshape.md
 :::
 
+:::{include} ../_snippets/functions/layout/to_geotile.md
+:::
+
 :::{include} ../_snippets/functions/layout/to_integer.md
 :::