不爲也 比不能也

Strict REST query string parameter parsingeditPrevious versions of Elasticsearch ignored unrecognized URL query string parameters. This means that extraneous parameters or parameters containing typographical errors would be silently accepted by Elasticsearch. This is dangerous from an end-user perspective because it means a submitted request will silently execute not as intended. This leniency h..

This section discusses the changes that you need to be aware of when migrating your application to Elasticsearch 2.3.여기에서는 application을 Elasticsearch 2.3 으로 migration할 경우 알아야 할 변경 사항에 대해 이야기한다.REST APIeditCORS support broken in 2.3.0 and 2.3.1editA change to the CORS implementation means that CORS support for pre-flight OPTIONS requests is broken in 2.3.0 and 2.3.1. This is fixed in 2.3.2.CORS 구..

Analysis is a process that consists of the following:analysis 프로세스는 다음과 같이 구성된다.First, tokenizing a block of text into individual terms suitable for use in an inverted index,먼저, 문장(text)을, inverted index에서 사용하기에 적합한, 개별 단어(term) 로 분리한다.Then normalizing these terms into a standard form to improve their "searchability" or recall그리고, "검색 능력", recall 을 개선하기 위해, 표준 형태로 이들 단어를 정규화한다.This job is perfor..

In order to be able to treat date fields as dates, numeric fields as numbers, and string fields as full-text or exact-value strings, Elasticsearch needs to know what type of data each field contains. This information is contained in the mapping.date field를 날짜로, 숫자 field를 숫자로, string field를 full-text나 exact-value 문자열로 처리하기 위해서는, Elasticsearch는 각 field가 가지고 있는 데이터의 type을 알아야 한다. 이 정보는 mapping에 있다...

When working with exact values, you will be working with non-scoring, filtering queries. Filters are important because they are very fast. They do not calculate relevance (avoiding the entire scoring phase) and are easily cached. We’ll talk about the performance benefits of filters later in All About Caching, but for now, just keep in mind that you should use filtering queries as often as you ca..

Queries can find only terms that actually exist in the inverted index, so it is important to ensure that the same analysis process is applied both to the document at index time, and to the query string at search time so that the terms in the query match the terms in the inverted index.query는 inverted index에 실제로 존재하는 단어만을 찾을 수 있다. 따라서 document를 index할할 때 적용되는 프로세스와, 검색 시 query string에 적용되는 프로세스가,..