[system test] Indexing is stuck for default bucket.

the index building activity on default bucket is extremely slow.

Though the indexer is not getting stuck here, the drain rate for the bucket is low at 20-30 items/sec.

Incoming sets ~ 1k

Attached is a screenshot of the index items pending
and drain rate of a single index

The ram/disk usage shows enough Index space on the indexer node.

attaching logs

[root@localhost logs]# df -kh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root 43G 3.5G 38G 9% /
tmpfs 12G 0 12G 0% /dev/shm
/dev/xvda1 477M 47M 405M 11% /boot
/dev/xvdb 374G 67M 355G 1% /disk0
[root@localhost logs]# free -g
total used free shared buffers cached
Mem: 22 14 8 0 0 2
-/+ buffers/cache: 11 11
Swap: 3 0 3
[root@localhost logs]#