ElasticSearch实战(七) API

• 创建索引

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1Request request = new Request("PUT", "/something");

2request.setJsonEntity(settingsAndMapping);

3restClient.performRequest(request);

4

settingsAndMapping

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1{

2   "settings": {

3       "index": {

4           "search": {

5               "slowlog": {

6                   "threshold": {

7                       "query": {

8                           "info": "100ms"

9                       }

10                  }

11              }

12          },

13          "number_of_shards": "5",

14          "number_of_replicas": "1"

15      }

16  },

17  "mappings": {

18      "sometype": {

19          "properties": {

20              "author": {

21                  "type": "text",

22                  "fields": {

23                      "keyword": {

24                          "type": "keyword",

25                          "ignore_above": 256

26                      }

27                  }

28              },

29              "date": {

30                  "type": "date"

31              },

32              "id": {

33                  "type": "long"

34              },

35              "likes": {

36                  "type": "long"

37              },

38              "text": {

39                  "type": "text",

40                  "analyzer": "ik_max_word",

41                  "search_analyzer": "ik_smart"

42              }

43          }

44      }

45  }

46}

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• 删除索引

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1Request request = new Request("DELETE", "/something");

2restClient.performRequest(request);

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• 索引一个文档

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1Request request = new Request("POST", "/something/sometype/");

2request.setJsonEntity("{\"author\":\"Mary Jones\",\"text\":\"Jane is an expert in her field\",\"tags\":\"expert\",\"likes\":80,\"date\":\"2019-06-21\"}");

3restClient.performRequest(request);

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• 指定ID索引文档

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1Request request = new Request("PUT", "/something/sometype/1/_create");

2request.setJsonEntity("{\"author\":\"Jane Smith\",\"text\":\"I am starting to get the hang of this...\",\"likes\":0,\"date\":\"2019-06-20\"}");

3restClient.performRequest(request);

4

• 获取文档

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1Request request = new Request("GET", "/something/sometype/1");

2Response response = restClient.performRequest(request);

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• 检查文档是否存在

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1Request request = new Request("HEAD", "/something/sometype/2");

2Response response = restClient.performRequest(request);

3if(response.getStatusLine().getStatusCode() == 404) {

4   //不存在

5}

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• 更新文档

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1Request request = new Request("PUT", "/something/sometype/1/_create");

2request.setJsonEntity("{\"author\":\"Jane Smith\",\"text\":\"I am starting to get the hang of this...\",\"likes\":1,\"date\":\"2019-06-20\"}");

3restClient.performRequest(request);

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• 删除文档

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1Request request = new Request("DELETE", "/something/sometype/1");

2restClient.performRequest(request);

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• 局部更新

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1Request request = new Request("POST", "/something/sometype/1/_update");

2request.setJsonEntity("{\"doc\":{\"likes\":1}}");

3restClient.performRequest(request);

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• 空搜索

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1Request request = new Request("GET", "/something/sometype/_search?from=0&size=10");

2Response response = restClient.performRequest(request);

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• 搜索

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1Request request = new Request("GET", "/something/sometype/_search?q=" + java.net.URLEncoder.encode("author:Jones", "UTF-8"));

2Response response = restClient.performRequest(request);

3

查询字符串的一些示例

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1q=Smith

2q=author:Smith

3q=+author:Smith +text:to

4q=+author:Smith -text:like

5q=+author:(Mary Fir John)

6q=+author:(Mary Fir John) +date:>2019-06-18

7q=date:2019

8q=date:2019-06-20

9q=likes:>=40

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