ElasticSearch replica shard unassigned -


i using elasticsearch 2.4. have configured cluster following configuration :

3 data nodes , 1 master node.

i have 5 indices each primary shard 1 , replica shard 1.

still cluster health in yellow.

2 of replica shards unassigned. have enough space available. following disk space usage :

enter image description here

since don't have enough experience elasticsearch , not able understand problem. according me should work fine because have 3 data nodes primary shard can on 1 node , secondary can on of other 2 nodes. not able understand behaviour.

please explain doing wrong here , reason such behaviour , steps should take in order recover this.

thank you.


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