Add state for updating Elasticsearch index templates

To prevent index template from constant or accidential update
add separate salt state to explicit use in order to update.

To use run:
  salt -C 'I@elasticsearch:client' state.sls elasticsearch.client.update_index_templates

Change-Id: I19aca3c6901f79ac22457a30aada0904057de5cc
Closes-Bug: PROD-17954
2 files changed