[Feature] GeoBounds Aggregation on Geo Shape field

[navneet1v]

Description

This issue tracks the implementation of GeoBounds Aggregation on Geo Shape field.

Tasks:

• Refactor code of GeoBounds Aggregation on GeoPoint from server to modules/geo folder.
• Backport the refactor code to 2.x branch
• Implement the GeoBounds on GeoShape field
  • Implement the code to convert the geobounds returned from doc value to internal aggregation.
  • Integration Tests
  • Unit Tests

Dependency

#4049

Useful Links

1. RFC for All Aggregations on GeoShape: [RFC] - Implement Aggregations on Geo Shape Field geospatial#84
2. GeoBounds RFC on GeoShape : [RFC] - Geo Bound Aggregation on Geo Shape Field geospatial#93
3. Low Level Implementation Proposal: [Proposal]: Low Level Implementation Details for Geo Shape Aggregation and future Geo related Features geospatial#92
4. Enable Doc values for GeoShape Field #4049
5. All Aggregation Implementation issue: Implement Aggregations on Geo Shape geospatial#104