Working with the latest Solr Trunk code and seems the Tika handlers for Solr Cell (ExtractingDocumentLoader.java) and Data Import handler (TikaEntityProcessor.java) fails to index the zip file contents again. It just indexes the file names again. This issue was addressed some time back, late last year, but seems to have reappeared with the latest code.
I had raised a jira for the Data Import handler part with the patch and the testcase - https://issues.apache.org/jira/browse/SOLR-2332. The same fix is needed for the Solr Cell as well. I can raise a jira and provide the patch for the same, if the above patch seems good enough. Regards, Jayendra