anchor.diff:  == Store
   
   The store module allows you to control how index data is stored and accessed on disk.
  +
  +NOTE: This is a low-level setting. Some store implementations have poor
  +concurrency or disable optimizations for heap memory usage. We recommend
  +sticking to the defaults.
   
   [float]
   [[file-system]]
  
positive.code: PUT /my_index
  {
    "settings": {
      "index.store.type": "niofs"
    }
  }
  ---------------------------------
  
negative.code: Elasticsearch will pick the best implementation based on the operating
  environment.
  
  The storage type can also be explicitly set for all indices by configuring the
  store type in the `config/elasticsearch.yml` file:
  
  [source,yaml]
  ---------------------------------
  index.store.type: hybridfs
  ---------------------------------
  
  It is a _static_ setting that can be set on a per-index basis at index
  