使用constant_score,把query转换成filter，可以减少根据TF-IDF算分导致的开销
使用AND 操作符，控制匹配同时出现Matrix和reloaded的文档
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IDF = log(全部文档数/检索词出现的文档总数)
ElasticSearch 极客时间课程笔记 04
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转载自blog.csdn.net/kuaipao19950507/article/details/103916589
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