Shards got stuck in INITIALIZING state


I'm on ES 1.4.0, java 1.7, 15 shards , and 1 replica

after adding new node to cluster two shards (backup) are stuck in INITIALIZING
state, while no errors in logs.

There is enough free space on all servers (more that 90%), also I see the
size of those stucked shards is increasing and is already more than size of
primary shards

I tried to set number of replicas to 0, then cluster became green

after that I did number of replicas 1, and the same shards stucked but on
different servers this time

what it can be?, thanks

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Hi any resolution for this? Thanks.