Changes to Get KV entry

added the new path request parameter bucket

added the new path request parameter key

the response property body/key became optional for the status 200

the response property body/value became optional for the status 200

added the non-success response with the status 400

added the optional property metadata/duration to the response with the 200 status

added the optional property metadata/field to the response with the 200 status

added the optional property metadata/hits to the response with the 200 status

added the optional property metadata/index_duration to the response with the 200 status

added the optional property metadata/index_hits to the response with the 200 status

added the optional property metadata/index_name to the response with the 200 status

added the optional property metadata/index_partitions to the response with the 200 status

added the optional property metadata/limit to the response with the 200 status

added the optional property metadata/partitions to the response with the 200 status

added the optional property metadata/search to the response with the 200 status

added the optional property metadata/stream to the response with the 200 status

added the optional property metadata/subject to the response with the 200 status