Add Index Health to Index Tab screen

[royrusso]

http://www.elasticsearch.org/guide/reference/api/admin-cluster-health/

for specific index:

The API can also be executed against one or more indices to get just the specified indices health:

$ curl -XGET 'http://localhost:9200/_cluster/health/test1,test2'

[royrusso]

For simplicity, add this data under the metrics tab per index.

{
cluster_name: "elasticsearch",
status: "green",
timed_out: false,
number_of_nodes: 3,
number_of_data_nodes: 3,
active_primary_shards: 5,
active_shards: 10,
relocating_shards: 0,
initializing_shards: 0,
unassigned_shards: 0
}