Completion field storing norms, payloads, pos and freqs

[adrianocrestani]

I have a completion field with the mapping below. When I use Luke to inspect the index, it shows that that field is storing Payloads, Norms, positions and freqs. I wonder why it needs all that data at all and how I could disable it. I am using ES 5.4.3.

"properties": {
  "find_nea": {
    "type": "completion",
    "analyzer": "index_analyzer",
    "preserve_position_increments": false
  }
}