: Is it possible when updating a numeric field to increment the existing value : instead of replacing it with a new value?
it's not currently possible to update a document "in place" at all -- you must provide all of the field values when doing an "update" -- this is largely due to some limitations impossed by lucene when dealing with fields that are indexed but unstored. (some discussion is currently taking place on the solr-dev list as to how to make some simple cases possible) -Hoss
