Apache Solr for TYPO3 CMS

When trying to use the textExtract-service for a pdf you'll usually stumble across cc_txtextexec which executes "pdftotext". However if just process() is called on the document the utf8-returned content is transformed into iso-8859-1. To avoid that configuration needs to be passed. Since the solr-interface uses utf8, we can hardcode "utf-8" there, and by that just avoid the unnecessary charset-conversion.

PS: dam does it this way as well in getFileMetaInfo().

If the charset isn't processed as utf-8, it later might lead to problems when htmlspecialchars() is called with utf-8 explicitly which can result in a completely empty content-field (and thus almost no content to send to the solr-server).