Unstable cluster - Elasticsearch version 1.3.2

I just upgraded my elasticsearch from 1.2.1. I have 5 node cluster with 3
master & 3 data nodes. (one master servers data)

During the upgrade, I restarted my whole cluster. (Till this time, my
cluster was very stable). The cluster status was red for almost 12 hours.
Since unassigned_shards was 20 & it never got allocated.
So, I manually reallocated by issuing the following commands

curl -XPOST 'localhost:9200/_cluster/
reroute' -d '{"commands" : [ {"allocate" : {"index" : "index1", "shard" :
0, "node" : "node2", "allow_primary" : true}}]}'

Then the cluster state changed to green immediately. And my indexes, search
works as normal.

But, my concern is curl on http://localhost:9200/_nodes is not working,
But, I can do search on indexes, I can do indexes etc.,

I don't see any issues in the logs.

Any help would be much appreciated.

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