Hi, I am trying to use Lucene index to implement a tag cloud system. I add a new field named "tags" in index to store all the tags,and we don't support tags with more than one word, so different tags of the same document just are separate by white space. The "tags" filed in one document may looks like this : doc1 tags : travel Beijing news doc2 tags: beijing sports news I can easily retrieve tags related with single document,and also get the documents related with certain tag, but it's hard find a "efficient" way to get frequent tags from a "set" of documents of this index.Tthe set of the documents is always generated dynamically, may be a search result, a dynamically generated category through clustering. The document set is very large, maybe several ten thousands or several hundred thousands.So simply iterate all the documents in the set and find the frequent tags might not be applicable.Do you have any better idea ?
Thanks -Qi
