索引2個文件到hotel 索引：
PUT /hotel/_doc/1
{
"title": "文雅酒店",
"city": "青岛",
"price": 556,
"create_time": "20200418120000",
"amenities": "浴池,普通停车场/充电停车场",
"full_room": false,
"location": {
"lat": 36.083078,
"lon": 120.37566
},
"praise": 10
}
PUT /hotel/_doc/2
{
"title": "金都嘉怡假日酒店",
"city": "北京",
"price": 337,
"create_time": "20210315200000",
"amenities": "wifi,充电停车场/可升降停车场",
"full_room": false,
"location": {
"lat": 39.915153,
"lon": 116.403
},
"praise": 60
}
PUT /hotel/_doc/1
{
"title": "文雅酒店",
"city": "青岛",
"price": 556,
"create_time": "20200418120000",
"amenities": "浴池,普通停车场/充电停车场",
"full_room": false,
"location": {
"lat": 36.083078,
"lon": 120.37566
},
"praise": 10
}
PUT /hotel/_doc/2
{
"title": "金都嘉怡假日酒店",
"city": "北京",
"price": 337,
"create_time": "20210315200000",
"amenities": "wifi,充电停车场/可升降停车场",
"full_room": false,
"location": {
"lat": 39.915153,
"lon": 116.403
},
"praise": 60
}GET /hotel/_search
{
"took" : 499,
"timed_out" : false,
"_shards" : {
"total" : 5,
"successful" : 5,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 2,
"relation" : "eq"
},
"max_score" : 1.0,
"hits" : [
{
"_index" : "hotel",
"_type" : "_doc",
"_id" : "2",
"_score" : 1.0,
"_source" : {
"title" : "金都嘉怡假日酒店",
"city" : "北京",
"price" : 337,
"create_time" : "20210315200000",
"amenities" : "wifi,充电停车场/可升降停车场",
"full_room" : false,
"location" : {
"lat" : 39.915153,
"lon" : 116.403
},
"praise" : 60
}
},
{
"_index" : "hotel",
"_type" : "_doc",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"title" : "文雅酒店",
"city" : "青岛",
"price" : 556,
"create_time" : "20200418120000",
"amenities" : "浴池,普通停车场/充电停车场",
"full_room" : false,
"location" : {
"lat" : 36.083078,
"lon" : 120.37566
},
"praise" : 10
}
}
]
}
}took# 值告訴我們執行整個搜尋請求耗費了多少毫秒。
_shards 部分告訴我們在查詢中參與分片的總數，以及這些分片成功了多少個失敗了多少個。正常情況下我們不希望分片失敗，但是分片失敗是可能發生的。如果我們遭遇到一種災難等級的故障，在這個故障中丟失了相同分片的原始資料和副本，那麼對這個分片將沒有可用副本來對搜尋請求作出回應。假若這樣，Elasticsearch 會報告這個分片是失敗的，但會繼續傳回剩餘分片的結果。
timed_out 值告訴我們查詢是否逾時。預設情況下，搜尋請求不會逾時。
傳回結果中最重要的部分是hits ，它包含total 欄位來表示符合到的文檔總數，並且一個hits 陣列包含所查詢結果的前十個文件。在解析搜尋結果時，我們通常需要關注以下幾個欄位：
hits.total.value：符合的文件總數。
hits.max_score：與查詢所符合文件的_score的最大值。
hits.hits：符合的文檔清單。
hits.hits._source：符合的文檔的原始資料。
hits.hits._score：符合的文件的分數。它衡量了文檔與查詢的匹配程度,默認情況下，首先返回最相關的文檔結果，就是說，返回的文檔是按照score 降序排列的。
hits.hits.highlight：符合的文件的高亮顯示資訊。
@Slf4j
@Service
public class ElasticSearchImpl {
@Autowired
private RestHighLevelClient restHighLevelClient;
public void searchUser() throws IOException {
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
SearchRequest searchRequest = new SearchRequest(new String[]{"hotel"},searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
TimeValue took = searchResponse.getTook();
System.out.println("took = " + took);
// 搜索结果
SearchHits searchHits = searchResponse.getHits();
// hits.total.value:匹配的文档总数
TotalHits totalHits = searchHits.getTotalHits();
long value = totalHits.value;
System.out.println("value = " + value);
// hits.max_score:与查询所匹配文档的_score的最大值
float maxScore = searchHits.getMaxScore();
System.out.println("maxScore = " + maxScore);
// hits.hits:匹配的文档列表
SearchHit[] hits = searchHits.getHits();
for (SearchHit hit : hits) {
// hits.hits._source：匹配的文档的原始数据
String sourceAsString = hit.getSourceAsString();
System.out.println("sourceAsString = " + sourceAsString);
// hits.hits._id：匹配的文档的id
String id = hit.getId();
System.out.println("id = " + id);
Map<String, DocumentField> fields = hit.getFields();
System.out.println("fields = " + fields);
String index = hit.getIndex();
System.out.println("index = " + index);
float score = hit.getScore();
System.out.println("score = " + score);
}
System.out.println(searchResponse);
}
}
@Slf4j
@Service
public class ElasticSearchImpl {
@Autowired
private RestHighLevelClient restHighLevelClient;
public void searchUser() throws IOException {
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
SearchRequest searchRequest = new SearchRequest(new String[]{"hotel"},searchSourceBuilder);
SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
TimeValue took = searchResponse.getTook();
System.out.println("took = " + took);
// 搜索结果
SearchHits searchHits = searchResponse.getHits();
// hits.total.value:匹配的文档总数
TotalHits totalHits = searchHits.getTotalHits();
long value = totalHits.value;
System.out.println("value = " + value);
// hits.max_score:与查询所匹配文档的_score的最大值
float maxScore = searchHits.getMaxScore();
System.out.println("maxScore = " + maxScore);
// hits.hits:匹配的文档列表
SearchHit[] hits = searchHits.getHits();
for (SearchHit hit : hits) {
// hits.hits._source：匹配的文档的原始数据
String sourceAsString = hit.getSourceAsString();
System.out.println("sourceAsString = " + sourceAsString);
// hits.hits._id：匹配的文档的id
String id = hit.getId();
System.out.println("id = " + id);
Map<String, DocumentField> fields = hit.getFields();
System.out.println("fields = " + fields);
String index = hit.getIndex();
System.out.println("index = " + index);
float score = hit.getScore();
System.out.println("score = " + score);
}
System.out.println(searchResponse);
}
}took=2ms
value = 2
maxScore = 1.0
sourceAsString = {"title":"金都嘉怡假日酒店","city":"北京","price":337,"create_time":"20210315200000","amenities":"wifi,充电停车场/可升降停车场","full_room":false,"location":{"lat":39.915153,"lon":116.403},"praise":60}
id = 2
fields = {}
index = hotel
score = 1.0
sourceAsString = {"title":"文雅酒店","city":"青岛","price":556,"create_time":"20200418120000","amenities":"浴池,普通停车场/充电停车场","full_room":false,"location":{"lat":36.083078,"lon":120.37566},"praise":10}
id = 1
fields = {}
index = hotel
score = 1.0{
"took": 2,
"timed_out": false,
"_shards": {
"total": 5,
"successful": 5,
"skipped": 0,
"failed": 0
},
"hits": {
"total": {
"value": 2,
"relation": "eq"
},
"max_score": 1.0,
"hits": [
{
"_index": "hotel",
"_type": "_doc",
"_id": "2",
"_score": 1.0,
"_source": {
"title": "金都嘉怡假日酒店",
"city": "北京",
"price": 337,
"create_time": "20210315200000",
"amenities": "wifi,充电停车场/可升降停车场",
"full_room": false,
"location": {
"lat": 39.915153,
"lon": 116.403
},
"praise": 60
}
},
{
"_index": "hotel",
"_type": "_doc",
"_id": "1",
"_score": 1.0,
"_source": {
"title": "文雅酒店",
"city": "青岛",
"price": 556,
"create_time": "20200418120000",
"amenities": "浴池,普通停车场/充电停车场",
"full_room": false,
"location": {
"lat": 36.083078,
"lon": 120.37566
},
"praise": 10
}
}
]
}
}1. ElasticSearch 搜尋結果中的_score 欄位是什麼意思？
答案：_score 欄位表示符合文件的相關度得分，分數越高表示匹配度越高。
2. ElasticSearch 搜尋結果中的 highlight 欄位是什麼意思？
答案：highlight 欄位表示符合文件中被高亮顯示的欄位及其高亮顯示的內容。
3. 如何取得 ElasticSearch 搜尋結果中的總文件數？
答案：可以透過 hits.total.value 欄位取得符合的文件總數。
4. 如何取得 ElasticSearch 搜尋結果中的符合文件清單？
答案：可以透過 hits.hits 欄位取得符合的文件清單。
5. 如何取得 ElasticSearch 搜尋結果中符合文件的原始資料？
答案：可以透過 hits.hits._source 欄位取得符合文件的原始資料。
6. 如何取得 ElasticSearch 搜尋結果中符合文件的高亮顯示資訊？
答案：可以透過 hits.hits.highlight 欄位取得符合文件的高亮顯示資訊。
7. ElasticSearch 搜尋結果中的 _shards 欄位是什麼意思？
答案：_shards 欄位表示搜尋涉及的分片訊息，包括總分片數、成功的分片數、跳過的分片數和失敗的分片數。
8. ElasticSearch 搜尋結果中的 took 欄位是什麼意思？
答案：took 欄位表示搜尋耗時，單位為毫秒。
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