[Test coverage improvements] Test coverage improvement for aggregations & other search qeuries for field mapping types.

[gashutos]

As of today, we have several types supported as a index field while creating index.
Like Int, Long, Float, half_float, sclaed_float, etc.
FieldMapper.java Gives idea about such field types. Search queries on those types have several hotpath and there are undercover paths which for which search query code path might not be exactly same. So modifying this code path might give some side effect for some data types while we improve/change some other data types.

For example, while introducing sort optimization for custom numeric types #10997, we got this nasty bug where half_float numeric type sort queries were completely broken.
Upon digging more, there aren't tests which were covering half_float basic sort queries validation.
As a part of this PR #11024, we have added that validation, but we do not have single test case for aggregation of half_float type.

I am creating this issue, to primary add integration tests for half_float aggregation search queries. But also validate for other field types and at least add basic search query tests for all field types.

[macohen]

@gashutos are you looking to pick this up or looking to help someone from the community work through this? If you want it, can you assign yourself please?