Get total term frequencies by date query - solr

Question

I'd like to know the "top 10 terms" from a query (which is just a date range query). I need "total term frequency" by date...not a count of documents and not just a count of term frequency across the entire index. I've looked into the Solr TermsComponent and Lucene's HighFreqTerms, but neither seems to support the operation I want as the result of a query.
My index is pretty simple...every item goes into the 'content' field which also has a 'dateCreated' field (to support the query). Any thoughts to the technique I could use?

Answer 1

When you query for the date in question, you can iterate through the scoreDocs returned, and get TermVectors for the content field like:
Terms terms = myIndexReader.getTermVector(currentScoreDoc.doc, "content");
and you can then iterate through terms.iterator(), and create a collection of counts for each of the terms (acquired from the TermsEnum.next() or TermsEnum.term() methods)

Answer 2

Faceting provides almost what you're looking for, but will give document frequencies for each term, not the total term frequencies. Make your date range query as a /select call, then add parameters:
* rows=0 since you don't want to see the documents found, just counts
* facet=true
* facet.field=<the field with the required terms>
* facet.limit=10 since you want top ten terms
Over a field called text, part of the response would look like:
<lst name="facet_counts">
<lst name="facet_queries"/>
<lst name="facet_fields">
<lst name="text">
<int name="from">3690</int>
<int name="have">3595</int>
<int name="it">3495</int>
<int name="has">3450</int>
<int name="one">3375</int>
<int name="who">3221</int>
<int name="he">3137</int>
<int name="up">3125</int>
<int name="all">3112</int>
<int name="year">3089</int>
</lst>
</lst>
<lst name="facet_dates"/>
<lst name="facet_ranges"/>
</lst>
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