: Neither Lucene nor Solr support those operators. I believe there is or : used to be a way to specify an open begin/end for the range query, but I : don't recall the exact details at the moment.
field:[* TO X] ... and field:[A TO *] there is (unfortunately) no mechanism in the QueryParser syntax for distibguishing between "less than" and "less than or equal to" -Hoss
