You shouldn't have to reindex the whole set of documents, unless you need that new field to be added to those existing documents. New documents that have that field would be searchable with that field, but older documents would not be returned. Reindexing would consist of removing the existing documents in the solr collection, and re running your indexing application (MRIT, solrj etc) to index all the original documents again. Alternatively you could have a solrj application that reads the old documents and adds the value to the document for the newly created field. Of course, you should test this in a QA environment to confirm the desired behavior. -pd
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