FLUME-2105. Add docs for MorphlineSolrSink.
FLUME-2105. Add docs for MorphlineSolrSink.

(Wolfgang Hoschek via Mike Percy)

szaboferee/flume,tmgstevens/flume,szaboferee/flume,tmgstevens/flume,tinawenqiao/flume,iaiengxia/flume,iaiengxia/flume,tmgstevens/flume,szaboferee/flume,tinawenqiao/flume,szaboferee/flume,iaiengxia/flume,iaiengxia/flume,tinawenqiao/flume,tinawenqiao/flume,tmgstevens/flume