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Creates the entry with the given key locally.
Steps:
1) It finds out the bucket region for the bucket id.
2) If from step 1 it gets null, that means the bucket is remapped.
3) If it finds the bucket region from step 1, it tries to creates the entry on the region.
4) If entry already exists, for the key, step 3 would throw EntryExistsException or else it
will create an entry
5) updateBucket2Size if bucket is on more than 1 node or else bucket listners would take care
of size update.