# Discription about explain api **URL:** \ **Category:** Elasticsearch\ **Created:** [February 11, 2014, 10:51am UTC](https://discuss.elastic.co/t/discription-about-explain-api/15723 "2014-02-11T10:51:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Navneet\_Mathpal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/navneet_mathpal/32/3677_2.png) [@Navneet\_Mathpal](https://discuss.elastic.co/u/Navneet_Mathpal)\ **Post date:** [February 11, 2014, 10:51am UTC](https://discuss.elastic.co/t/discription-about-explain-api/15723/1 "2014-02-11T10:51:37Z")
hi , I want to know about follwing things about the explain api, description: score(doc=0,freq=1.0 = termFreq=1.0 ) what does mean of freq=0 and docs=0 description: idf(docFreq=1, maxDocs=1) value: 2.304384 what is the docFreq and how it calculated and what is the maxdocs and how does it calculated. -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/840249ae-fc9c-450e-aebf-0f96c2142902%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/840249ae-fc9c-450e-aebf-0f96c2142902%40googlegroups.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![spinscale](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/spinscale/32/25011_2.png) [@spinscale](https://discuss.elastic.co/u/spinscale)\ **Post date:** [February 11, 2014, 1:45pm UTC](https://discuss.elastic.co/t/discription-about-explain-api/15723/2 "2014-02-11T13:45:38Z")
Hey, the description about tf/idf similarity in the lucene javadocs might help here: [https://lucene.apache.org/core/4\_0\_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html](https://lucene.apache.org/core/4_0_0/core/org/apache/lucene/search/similarities/TFIDFSimilarity.html) --Alex On Tue, Feb 11, 2014 at 11:51 AM, Navneet Mathpal \< [navneetmathpal93@gmail.com](mailto:navneetmathpal93@gmail.com)\> wrote: > hi , > > I want to know about follwing things about the explain api, > > description: score(doc=0,freq=1.0 = termFreq=1.0 ) what does mean of > freq=0 and docs=0 > > description: idf(docFreq=1, maxDocs=1) value: 2.304384 what is the > docFreq and how it calculated and what is the maxdocs and how does it > calculated. > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/840249ae-fc9c-450e-aebf-0f96c2142902%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/840249ae-fc9c-450e-aebf-0f96c2142902%40googlegroups.com) > . > For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAGCwEM\_qr4NwNNkk2AxTvXwzkFqP71ys\_\_BZHo%3D%2BfpTw9c87tA%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAGCwEM_qr4NwNNkk2AxTvXwzkFqP71ys__BZHo%3D%2BfpTw9c87tA%40mail.gmail.com). For more options, visit [https://groups.google.com/groups/opt\_out](https://groups.google.com/groups/opt_out). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:51am UTC](https://discuss.elastic.co/t/discription-about-explain-api/15723/3 "2017-07-06T01:51:05Z")