CentOS 7 使用Docker方式搭建ElasticSearch 7.7.0 三节点集群，并配置elasticsearch-head插件，ik分词器，以及Kibana可视化平台

以下是搭建Elasticsearch 7.7.0三节点集群的基本步骤，使用Docker方式：

1. 准备Elasticsearch Docker配置文件 elasticsearch.yml 和 docker-compose.yml。

elasticsearch.yml 示例配置：

cluster.name: my-es-cluster
node.name: node-1
network.host: 0.0.0.0
discovery.seed_hosts:
  - node-1
  - node-2
  - node-3
cluster.initial_master_nodes:
  - node-1
  - node-2
  - node-3
http.cors.enabled: true
http.cors.allow-origin: "*"

docker-compose.yml 示例配置（三个节点）：

version: '2.2'
services:
  es01:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.7.0
    container_name: es01
    environment:
      - node.name=node-1
      - cluster.name=my-es-cluster
      - discovery.seed_hosts=es02,es03
      - cluster.initial_master_nodes=node-1
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata01:/usr/share/elasticsearch/data
    ports:
      - 9200:9200
    networks:
      - esnet
  es02:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.7.0
    container_name: es02
    environment:
      - node.name=node-2
      - cluster.name=my-es-cluster
      - discovery.seed_hosts=es01,es03
      - cluster.initial_master_nodes=node-1
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata02:/usr/share/elasticsearch/data
    networks:
      - esnet
  es03:
    image: docker.elastic.co/elasticsearch/elasticsearch:7.7.0
    container_name: es03
    environment:
      - node.name=node-3
      - cluster.name=my-es-cluster
      - discovery.seed_hosts=es01,es02
      - cluster.initial_master_nodes=node-1
      - bootstrap.memory_lock=true
      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
    ulimits:
      memlock:
        soft: -1
        hard: -1
    volumes:
      - esdata03:/usr/share/elasticsearch/data
    networks:
      - esnet
volumes:
  esdata01:
    driver: local
  esdata02:
    driver: local
  esdata03:
    driver: local
networks:
  esnet:
    driver: