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The dynamic template is very handy when you need to set a mapping configuration to all the fields. This action can be done by adding a dynamic template, similar to this one:

"dynamic_templates" : [
  {
    "store_generic" : {
     "match" : "*",
      "mapping" : {
        "store" : "true"
      }
    }
  }
]

In this example, all the new fields, which will be added with explicit mapping, will be stored.