Elasticsearch configuration for autocompletion search

createIndex

{
  settings: {
    number_of_shards: 1,
    analysis: {
      filter: {
        autocomplete_filter: {
          type: 'ngram',
          min_gram: 3,
          max_gram: 15
        }
      },
      analyzer: {
        autocomplete: {
          type: 'custom',
          tokenizer: 'standard',
          filter: [
            'lowercase',
            'autocomplete_filter'
          ]
        }
      }
    }
  },
  mappings: {
    [type]: {
      properties: {
        name: {
          type: 'string',
          fields: {
            autocomplete: {
              type: 'string',
              analyzer: 'autocomplete',
              search_analyzer: 'standard'
            }
          }
        },
        twitter_keywords: {
          type: 'string',
          fields: {
            autocomplete: {
              type: 'string',
              analyzer: 'autocomplete',
              search_analyzer: 'standard'
            }
          }
        },
        instagram_keywords: {
          type: 'string',
          fields: {
            autocomplete: {
              type: 'string',
              analyzer: 'autocomplete',
              search_analyzer: 'standard'
            }
          }
        }
      }
    }
  }
}

query

{
  query: {
    multi_match: {
      query,
      type: 'most_fields',
      fields: [ '*_keywords^4', 'name^8', '*_keywords.autocomplete', 'name.autocomplete^2' ]
    }
  }
}