不爲也 比不能也

A number of changes have been made to mappings to remove ambiguity and to ensure that conflicting mappings cannot be created.모호함을 제거하고, mapping의 충돌이 일어나지 않도록 하기 위해, mapping에 많은 변경이 있었다.One major change is that dynamically added fields must have their mapping confirmed by the master node before indexing continues. This is to avoid a problem where different shards in the same index dynamically add..

Min doc count defaults to zeroeditBoth the histogram and date_histogram aggregations now have a default min_doc_count of 0instead of 1.histogram 과 date_histogram aggregation 둘 모두는 min_doc_count 의 기본값으로 1 대신에 0 을 가진다.Timezone for date fieldeditSpecifying the time_zone parameter in queries or aggregations on fields of type date must now be either an ISO 8601 UTC offset, or a timezone id. For examp..

Lucene (and thus Elasticsearch) uses the Boolean model to find matching documents, and a formula called the practical scoring function to calculate relevance. This formula borrows concepts from term frequency/inverse document frequency and the vector space model but adds more-modern features like a coordination factor, field length normalization, and term or query clause boosting.Lucene과 Elastic..

For multiterm queries, Lucene takes the Boolean model, TF/IDF, and the vector space model and combines them in a single efficient package that collects matching documents and scores them as it goes.다중 단어 query의 경우, Lucene은 Boolean model, TF/IDF 그리고, vector space model을 가지고, 일치하는 document를 수집하고, score를 계산하는, 하나의 효율적인 패키지로 그들을 조합한다.A multiterm query like다중 단어 query는GET /my_index/doc/_search { "que..