Resetting Elasticsearch

Perform a reset if the state of Elasticsearch and Historical Metrics needs to be cleared (such as if an index is deleted and erroneously recreated without the Swarm schema). A reset is a method to delete an index and refresh a feed safely, by deleting feeds before removing index data.

Set Swarm's configuration setting metrics.target to blank (which can be performed using SNMP or REST).

curl -i -u admin:PASSWORD -XPUT "http://SWARM·NODE:91/api/storage/clusters/CLUSTER·NAME/settings/metrics.target?value="

Delete the current Search Feed definition in the Swarm UI.
Delete the Swarm search index.
1. Use the following command to determine the Swarm search index:
```
curl http://ES·NODE:9200/_cat/indices | grep 'index_SWARM·CLUSTER·NAME'
```
2. Run the following command to delete the Swarm search index:
```
curl -X DELETE http://ES·NODE:9200/SWARM·SEARCH·INDEX
```
Delete historical metrics indices as needed.
The following command deletes all metrics indices. Verify the glob pattern used to avoid deleting needed indices.
```
curl -X DELETE 'http://ES·NODE:9200/metrics-SWARM·CLUSTER·NAME-*'
```
Create a new Search Feed definition pointing to the ES servers in the UI (Swarm UI or legacy Admin Console). (This step creates the feed using the Swarm schema.)

Reinitialize the curator:

/usr/share/caringo-elasticsearch-metrics/bin/metrics_curator -n -v

Reset the Swarm setting metrics.target back to the correct value (which can be performed using SNMP or REST).

curl -i -u admin:PASSWORD -XPUT --data-binary '{"metrics.target":"METRICS·HOST"}' \
http://SWARM·NODE:91/api/storage/clusters/CLUSTER·NAME/settings/metrics.target