[FEATURE] Group documents into clusters using Cluster layer #250

Is your feature request related to a problem?

As OpenSearch Maps user, i should be able to reduce points/shapes in an index by grouping them into clusters based on proximity to one another. If large number of points/shapes are very close to each other, it is very hard to know the accurate count of points/shapes. It could be deceptive. Hence, Clustering allows users to visually show those large dataset in concise way in small areas.

What solution would you like?

Maps should support a new layer called "Cluster layer" which can aggregate all points/shapes from an index using geospatial aggregations (metric/bucket).

What alternatives have you considered?

N/A

Do you have any additional context?

A/A

Example of cluster layer output