Spec: Fixes URL links to documentation

Closes #8656
Docs: Adds documentation for indices.exists_template

Closes: #8657
Update to Jackson 2.4.3

- Update pom to 2.4.3 from 2.4.2
- Enable the CBOR data header (aka tag) from the CBOR Generator to provide binary identification like the Smile format
- Check for the CBOR header and ensure that the data sent in represents a "major type" that is an object
- Cleans up `JsonVsCborTests` unused imports
Fix for geohash neighbors when geohash length is even.
We don't have to set XLimit and YLimit depending on the level (even or odd), since semantics of x and y are already swapped on each level.
XLimit is always 7 and YLimit is always 3.

Close #8526
Adding unit test for even / odd boundary condition