不爲也 比不能也

Like this post? Love numbers and Elasticsearch? I’ll be at Elastic{ON} to meet with attendees face to face and answer your questions. Consider attending the event. Hope to see you there.Imagine being able index your calendar to quickly find all events whose time range conflicts with a proposed event. Or creating a global television guide to find all shows, movies, sports, or broadcasts that are ..

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..

Queries and filters mergededitQueries and filters have been merged — all filter clauses are now query clauses. Instead, query clauses can now be used in query context or in filter context:query와 filter는 통합되었다. 모든 filter절은 이제 query절이다. 대신, 이제 query절은 query context 나 filter context 에서 사용된다.Query contextA query used in query context will calculate relevance scores and will not be cacheable. Query c..

The query DSL is a flexible, expressive search language that Elasticsearch uses to expose most of the power of Lucene through a simple JSON interface. It is what you should be using to write your queries in production. It makes your queries more flexible, more precise, easier to read, and easier to debug.query DSL은 간단한 JSON interface를 이용해, Lucene을 100% 활용하기 위해, Elasticsearch가 사용하는 유연하고, 표현력 있는 검..

Real world search requests are never simple; they search multiple fields with various input text, and filter based on an array of criteria. To build sophisticated search, you will need a way to combine multiple queries together into a single search request.현실에서 검색 request는 결코 간단하지 않다. 다양한 입력 문자열과 여러 조건의 배열을 기반으로 한 filter를 가지고 다수의 field를 검색한다. 정교한 검색을 위해, 하나의 검색 request에 다수의 query를 함께 조합해야 한다.To ..

The previous two examples showed a single filter in use. In practice, you will probably need to filter on multiple values or fields. For example, how would you express this SQL in Elasticsearch?앞의 두 가지 예제는 단일 filter의 사용을 보여준다. 실제 상황에서는, 아마도 여러 값 또는 field를 filtering해야 할 것이다. 예를 들면, 아래의 SQL을 Elasticsearch에서는 어떻게 표현할까?SELECT product FROM products WHERE (price = 20 OR productID = "XHDK-A-1293-#fJ3")..

Earlier in this chapter (Internal Filter Operation), we briefly discussed how non-scoring queries are calculated. At their heart is a bitset representing which documents match the filter. When Elasticsearch determines a bitset is likely to be reused in the future, it will be cached directly in memory for later use. Once cached, these bitsets can be reused wherever the same query is used, without..

In Combining Filters we discussed how to use the bool filter to combine multiple filter clauses with and, or, and not logic. In query land, the bool query does a similar job but with one important difference.Combining Filters에서, 다수의 filter 절을 and, or, not 으로 조합하기 위해, bool filter를 사용하는 방법에 대해 이야기한 바 있다. query에서도, bool query는 비슷한 작용을 하지만, 한가지 중요한 차이점이 있다.Filters make a binary decision: should this..