How to do it...

The definition of a completion field is similar to the previous core type fields. For example, to provide a suggestion for a name with an alias, we can write a similar mapping similar to the following:

{
  "name": {"type": "string", "copy_to":["suggest"]},
  "alias": {"type": "string", "copy_to":["suggest"]},
  "suggest": {
    "type": "completion",
    "payloads": true,
    "analyzer": "simple",
    "search_analyzer": "simple"
  }
}

In this example, we have defined two string fields: name and alias, as well as a suggest completer for them.