不爲也 比不能也

With 5.0 on the horizon, a number of query types deprecated in 2.x will be removed. Many of those are replaced by functionality of the bool query, so here’s a quick guide on how to move away from filtered queries; and, or, not queries; and a general look into how to parse boolean logic with the bool query.5.0 이 출시되면서, 2.x 에서 deprecate된 많은 query 유형이 제거된다. 그들 중 많은 부분이 bool query 기능으로 대체된다. 그래서, 여기..

I remember a couple years ago I was at a convention talking to folks about Elasticsearch or Lucene and one of them said something like "Everyone knows that if you really want to search fast you need to just use term queries." He was certainly right about term queries being fast but I really wanted to run some numbers and see just how right he was. And that felt like a good time to write a blog p..

If we could search for only one word at a time, full-text search would be pretty inflexible. Fortunately, the match query makes multiword queries just as simple:한번에 한 단어만을 검색할 수 있다면, full-text 검색은 아주 융통성 없는 검색일 것이다. 하지만, matchquery는 간단하게 여러 단어로 된 query를 만들 수 있다.GET /my_index/my_type/_search { "query": { "match": { "title": "BROWN DOG!" } } }COPY AS CURLVIEW IN SENSE The preceding query returns a..

By now, you have probably realized that multiword match queries simply wrap the generated termqueries in a bool query. With the default or operator, each term query is added as a should clause, so at least one clause must match. These two queries are equivalent:이제, 다중 단어 match query는, 생성된 term query를 단순히 bool query로 감싼 것이라는 것을 알게 되었을 것이다. 각 term query가, 기본인 or operator와 함께, should 절에 추가된다. 따라서, ..

Imagine that we have a website that allows users to search blog posts, such as these two documents:사용자들이 블로그 포스트를 검색할 수 있는 website를 가지고 있다고 가정해 보자. 다음과 같이 2개의 document가 있다.PUT /my_index/my_type/1 { "title": "Quick brown rabbits", "body": "Brown rabbits are commonly seen." } PUT /my_index/my_type/2 { "title": "Keeping pets healthy", "body": "My quick brown fox eats rabbits on a regular basis." }C..

The biggest disadvantage of keeping stopwords is that of performance. When Elasticsearch performs a full-text search, it has to calculate the relevance _score on all matching documents in order to return the top 10 matches.불용어를 유지하는 경우의 가장 큰 단점은 성능이다. Elasticsearch가 full-text 검색을 수행할 경우, 상위 10개의 document를 반환하기 위해, 일치하는 모든 document의 relevance _score 를 계산해야 한다.While most words typically occur in m..