: Exactly, and the question is how to populate at index time a boolean field : based on the content of another one ? : My initial idea was to make a copy of the initial field - and 'filter' it : to a boolean value (by specifying some analyzer in schema.xml) - but , as I : said, I might miss some basic Solr ideas.
your theory makes sense, but implementing it with an analyzer probably isn't the best choice: analyzers only work on TextFields, and it would make a lot more sense for this to be a BooleanField I would suggest using some update processors for this... https://wiki.apache.org/solr/UpdateRequestProcessor Starting with Solr 4.0 there is a toolkit of easy to re-use UpdateProcessorFactories for dealing with field values. What you are describing could be done fairly easily by using the CloneFieldUpdateProcessorFactory + RegexReplaceUpdateProcessorFactory + DefaultValueUpdateProcessorFactory... https://lucene.apache.org/solr/api-4_0_0-BETA/org/apache/solr/update/processor/CloneFieldUpdateProcessorFactory.html https://lucene.apache.org/solr/api-4_0_0-BETA/org/apache/solr/update/processor/RegexReplaceProcessorFactory.html https://lucene.apache.org/solr/api-4_0_0-BETA/org/apache/solr/update/processor/DefaultValueUpdateProcessorFactory.html Something like this would probably work... <processor class="solr.CloneFieldUpdateProcessorFactory"> <arr name="source"> <str>specialField</str> </arr> <str name="dest">hasValueOfSpecialField</str> </processor> <processor class="solr.RegexReplaceProcessorFactory"> <str name="fieldName">hasValueOfSpecialField</str> <str name="pattern">.+</str> <str name="replacement">true</str> </processor> <processor class="solr.DefaultValueUpdateProcessorFactory"> <str name="fieldName">hasValueOfSpecialField</str> <str name="value">false</str> </processor> ...but you may have to tinker. -Hoss
