Does kibana/marvel handle overriding the default index template e.g. to raise the shard value? I tried doing this the other day only to find that kibana/marvel could no longer find the cluster and I started to see Serialization exceptions in the elasticsearch client node logs.
After deleting the template and restarting the cluster, created according to the guidance shown here, though with a different name:
...the cluster was discovered again. However, I now have marvel running too few shards which will create its own problems.