Good point. The documentation is not clear enough.
By default all properties (content, title, name, author, keywords, date, content_type, content_length, language) are extracted. So don't specify "properties" field if you need that.
Otherwise write something like "properties": [ "content", "title" ]
If you have an HTTP service which exposes your PDF binary docs somewhere, yes you can add a link to the document.
Can't recall from the top of my head where exactly is the option but if you can't find it by yourself, you can ask on #kibana for help.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.