ElasticSearch基础：从倒排索引说起，快速认知ES

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<dependency>
	<groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.8.0</version>
</dependency>
<dependency>
	<groupId>org.elasticsearch.client</groupId>
	<artifactId>elasticsearch-rest-client</artifactId>
	<version>7.8.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>7.8.0</version>
</dependency>

elasticsearch:
  host: 11.50.36.97
  port: 9200

@Configuration
@ConfigurationProperties(prefix = "elasticsearch")
@Data
public class ESConfig {

    private String host;

    private Integer port;

    @Bean(destroyMethod = "close")
    public RestHighLevelClient client(){
        return new RestHighLevelClient(RestClient.builder(new HttpHost(host, port)));
    }
}

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest(classes = DemoApplication.class)
@Slf4j
public class BasicTest {
    @Autowired
    private RestHighLevelClient client;

	 /**
     * 添加索引
     *
     * @throws IOException
     */
    @Test
    public void addIndex() throws IOException {
        //1.使用client获取操作索引对象
        IndicesClient indices = client.indices();
        //2.具体操作获取返回值
        //2.1 设置索引名称
        CreateIndexRequest createIndexRequest = new CreateIndexRequest("person");

        CreateIndexResponse createIndexResponse = indices.create(createIndexRequest, RequestOptions.DEFAULT);
        //3.根据返回值判断结果
        System.out.println(createIndexResponse);
    }
    
    /**
     * 查询所有的索引
     *
     * @throws IOException
     */
    @Test
    public void indexTest() throws IOException {
        GetAliasesRequest request = new GetAliasesRequest();
        GetAliasesResponse alias = client.indices().getAlias(request, RequestOptions.DEFAULT);

        Map<String, Set<AliasMetadata>> map = alias.getAliases();
        map.forEach((k, v) -> {
            if (!k.startsWith(".")) {
                System.out.println(k);
            }
        });
    }
}

useradd es
passwd es 
chown -R es elasticsearch

vim /etc/security/limits.conf

*        soft       nofile        65536
*        hard       nofile        65536
*        soft       nproc         4096
*        hard       nproc         4096

vim /etc/sysctl.conf

vm.max_map_count=262144

sysctl -p

su es
vim config/elasticsearch.yml

# 1. 修改集群名称
cluster.name: test-es
# 2. 修改当前的es节点名称
node.name: node-1
# 3. 修改data数据保存地址（按自己的实际路径填写）
path.data: /export/test/elasticsearch-7.13.2/data
# 4. 日志数据保存地址（按自己的实际路径填写）
path.logs: /export/test/elasticsearch-7.13.2/logs
# 5. 绑定es网络ip
network.host: 0.0.0.0
# 6. 修改初始化master节点
cluster.initial_master_nodes: ["node-1"]

cd bin
./elasticsearch

{
  "name" : "node-1",
  "cluster_name" : "elasticsearch",
  "cluster_uuid" : "vMavXuuVTbmqykZpDEM0zQ",
  "version" : {
    "number" : "7.13.2",
    "build_flavor" : "default",
    "build_type" : "zip",
    "build_hash" : "4d960a0733be83dd2543ca018aa4ddc42e956800",
    "build_date" : "2021-06-10T21:01:55.251515791Z",
    "build_snapshot" : false,
    "lucene_version" : "8.8.2",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

./bin/elasticsearch -d

# 指向我们安装好的ES服务地址
elasticsearch.hosts: ["http://11.50.36.97:9200/"]