: the terms count go +1 for that specific term. for example, if I have
: two documents in index, each with tag="ccc" and if I update one of the
: documents, the terms frequency for ccc becomes 3. when I optimize the
: index, it goes down again to correct number. (2)

http://wiki.apache.org/solr/TermsComponent

>> Retrieving terms in index order is very fast since the implementation 
>> directly uses Lucene's TermEnum to iterate over the term dictionary. 
...
>> The doc frequencies returned are the number of documents that match the 
>> term, including any documents that have been marked for deletion but 
>> not yet removed from the index. 

: Is there any way to get the exact term frequency?

field faceting.


-Hoss

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