Aggregate class does not contain geohex_grid kind

[alainbodiguel]

Description

The class co.elastic.clients.elasticsearch._types.aggregations.Aggregate is missing the geohex_grid kind (version 8.4.1)

[alainbodiguel]

This is a blocking issue: impossible to use geohex aggregation without this.

[l-trotta]

Closing this as the fixes were already merged, thanks for the report!