fixes #3138 . Update istatistics after operation is run and  before response is send to client
merge
update after comments on pr
update after comments on pr .2
checkstyle fix
javadoc update for PartitionClientRequest
javadoc update for PartitionClientRequest
Merge pull request #3141 from sancar/fix/testMapStatistics/master

fixes #3138 . Update statistics after operation is run and before response is send to client