# 常用 API

# 1.获取集群设置

使用 Java Low Level REST Client

 public final RestClient restClient = RestClient
            .builder(new HttpHost("172.18.90.40", 9200, "http"))
            .build();

    @Test
    public void search() throws IOException {
        Map<String, String> params = Collections.emptyMap();

        String queryString = "{" +
                "  \"size\": 20," +
                "  \"query\": {" +
                "   \"range\": {" +
                "     \"createTime\": {" +
                "       \"gte\": \"2018-06-01 00:00:00\"" +
                "     }" +
                "   }" +
                "  }" +
                "}";

        HttpEntity entity = new NStringEntity(queryString, ContentType.APPLICATION_JSON);

        try {

        Response response = restClient.performRequest("GET", "/some_important_index*/_search", params, entity);
        System.out.println(response.getStatusLine().getStatusCode());
        String responseBody = null;

        responseBody = EntityUtils.toString(response.getEntity());
        System.out.println("******************************************** ");

        JSONObject jsonObject = JSON.parseObject(responseBody);


        System.out.println(jsonObject.get("hits"));
        }catch (ResponseException e){
            e.printStackTrace();
        }
        System.out.println("23333");
        
    }

# 2.常用rest请求

• term 精确查找，匹配多个值 terms

  {
    "query": {
      "term": {
        "FIELD": {
          "value": "VALUE"
        }
      }
    }
  }
  
  // 多个值
  {
    "query": {
      "terms": {
        "FIELD": [
          "VALUE1",
          "VALUE2"
        ]
      }
    }
  }
  

• nested类型字段，每个path要一层层点下去

  {
      "query": {
          "bool": {
              "must": [{
                      "nested": {
                          "path": "relations",
                          "query": {
                              "term": {
                                  "relations.relationTypeName": {
                                      "value": "运行于"
                                  }
                              }
                          }
                      }
                  }, {
                      "nested": {
                          "path": "relations",
                          "query": {
                              "nested": {
                                  "path": "relations.instances",
                                  "query": {
                                      "term": {
                                          "relations.instances.instanceName": {
                                              "value": "APPID_mcrm-zuul-core"
                                          }
                                      }
                                  }
                              }
                          }
                      }
                  }, {
                      "bool": {
                          "should": [{
                                  "query_string": {
                                      "default_field": "resourceType.resourceTypeCode",
                                      "query": "mo*"
                                  }
                              }, {
                                  "term": {
                                      "resourceType.resourceTypeCode": {
                                          "value": "container"
                                      }
                                  }
                              }
                          ]
                      }
                  }
              ]
          }
      }
  }
  
  

  对应 hightlevelclient

  BoolQueryBuilder instanceQueryBuilder = QueryBuilders.boolQuery()；
  instanceQueryBuilder.must(QueryBuilders.nestedQuery("relations", QueryBuilders.termQuery("relations.relationTypeName", "归属于"), ScoreMode.None));
  instanceQueryBuilder.must(QueryBuilders.nestedQuery("relations", QueryBuilders.nestedQuery("relations.instances", QueryBuilders.termQuery("relations.instances.instanceName", appId), ScoreMode.None), ScoreMode.None));