Vector Space Model The vector space model provides a way of comparing a multiterm query against a document. The output is a single score that represents how well the document matches the query. In order to do this, the model represents both the docum
Theory Behind Relevance Scoring 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 d
Field-length norm How long is the field? The shorter the field, the higher the weight. If a term appears in a short field, such as a title field, it is more likely that the content of that field is about the term than if the same term appears in a mu
读取文件,获取json格式的数据doc, 然后使用 bulkRequestBuilder.add(client.prepareIndex(index, type, id).setSource(doc)); 往ES中批量插入文档,接着就报下面这个异常错误: java.lang.IllegalArgumentException: The number of object passed must be even but was [1] 后来,花了点时间,才查到原因: ES 变更版本后,此处代码不适用,