Commits on Apr 26, 2018

1. Provide same data structure as X-Pack for ES node_stats …

   This PR adds a flag `xpack.enabled` to the Elasticsearch Metricbeat module. If enabled the data is transformed to the format as X-Pack Monitoring needs for the UI. It overwrites the index with `monitoring`.
   
   A config to enable the feature currently looks as following:
   
   ```
   metricbeat.modules:
   - module: elasticsearch
     metricsets: ["node_stats"]
     hosts: ["localhost:9200"]
     period: 1s
     xpack.enabled: true
   ```
   
   * Data is sent to the index `.monitoring-es-6-mb-{date}`. This is hard coded.
   * To enabled the feature `xpack.enabled` has to be set in the module
   * If a node is master is checked on each request as it can change over time. The master request is not atomic so this information could be inaccurate. The master detection also only works correctly, if data is fetched from only 1 node.
   * The cluser_uuid is fetched on the first request and cached from then based on the assumption that the cluster_id for a node id does not change over time.
   * `limit_in_bytes` and `usage_in_bytes` are provided as string by ES and not converted to int as they could overflow in ES.
   * Experimental message is logged when used. The feature is not documented yet on purpose.
   
   As the data goes into a separate index it is expected that monitoring already has loaded the template.

   

   ruflin committed Apr 26, 2018
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2. remove deep update

   

   ruflin committed Apr 26, 2018
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