SolrCloud 4.4 shard range has become null

[ilansch <ho...@walla.com>]

Hi,
We have 3 servers and load balancer.
on each server we run 1 shard with a leader and replica + zookeeper host
lately i receive exception "No active slice servicing hash code f02c79de in
collection1"
I viewed clusterstate.json and saw that shard3 range has been set to null,
after investigation i came up with this:
The intial zookeeper DzkHost setup was with list of hostnames.
There was power shutdown in lab - and machine of shard3 has restarted ok but
the hostname has changed.

What was the effect on zookeer/solrcloud configuration -> range on shard 3
is null.
Since the configuration was made with compositeId router, i cannot delete
and create the shard over again. 
What is the proper way to handle case like this ?
If i restore the original hostname will it fix it ?






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