message: replace _all with this.field
diff: @@ -23,7 +23,7 @@ export class SuggestionsAccessor extends Accessor {
  max_errors : 1,
  gram_size : 4,
  direct_generator : [{
  - field : "_all",
  + field :this.field,
  suggest_mode : "always",
  min_word_length : 1
  }]
  