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In Solrj 4.3, setUserMultipartRequest is exposed. Rather then encoding the metadata in the URL string, we should send it in the request body
SolrJ should use multipart forms for Solr Cloud
SolrJ is still on httpcomponents/httpclient version 4.2.x, which has some problems
Metadata names with illegal URL characters blow up the ManifoldCF solr connector
SolrJ, by preventing multi-part post, loses key information about file name that Tika needs
stream_size and stream_name can't be sent