Elasticsearch 6ではindex定義に'_type'が必要

Elasticsearch 7以上の場合はindexのmapping定義の_types

環境

Docker環境で以下の時

• Elasticsearch 6.8.20
• kibana 6.8.20
• PHP7

docker-compose.yml

version: '3'
services:
  # 省略...
  es:
    image: docker.elastic.co/elasticsearch/elasticsearch:6.8.20
    environment:
        - discovery.type=single-node
        - cluster.name=docker-cluster
        - bootstrap.memory_lock=true
        - "ES_JAVA_OPTS=-Xms1g -Xmx1g"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    ports:
        - "9200:9200"
    volumes:
        - es-data:/usr/share/elasticsearch/data
  kibana:
    image: docker.elastic.co/kibana/kibana:6.8.20
    ports:
        - "5601:5601"
    environment:
      ELASTICSEARCH_HOSTS: http://es:9200

  # 省略...

volumes:
  es-data:

  # 省略...

問題

In Connection.php line 636:

  {"error":{"root_cause":[{"type":"action_request_validation_exception","reason":"Validation Fail  
  ed: 1: type is missing;2: type is missing;3: type is missing;4: type is missing;5: type is miss  
  ing;6: type is missing;7: type is missing;8: type is missing;9: type is missing;10: type is mis  
  sing;11: type is missing;12: type is missing;13: type is missing;14: type is missing;15: type i  
  s missing;16: type is missing;17: type is missing;18: type is missing;19: type is missing;20: t  
  ype is missing;21: type is missing;22: type is missing;23: type is missing;24: type is missing;  
  25: type is missing;26: type is missing;27: type is missing;28: type is missing;29: type is mis  
  sing;30: type is missing;31: type is missing;32: type is missing;33: type is missing;34: type i  
  s missing;35: type is missing;36: type is missing;37: type is missing;38: type is missing;39: t  
  ype is missing;40: type is missing;41: type is missing;42: type is missing;43: type is missing;  
  44: type is missing;45: type is missing;46:

...

上記が出る

解決法

Elasticsearch 6以下では _typeの記述が必要なので下記のように書いておく。

// 一例です

    public function index(int $id): array
    {
        return [
            'index' => [
                '_index' => 'index_name',
                '_type' => 'index_type',
                '_id' => $id,
            ],
        ];
    }

補足

Elasticsearch 7以降ではタイプレスAPIとして_typeがデフォルトで_docに設定されるようなので、指定は不要。