Configuring SolrSearch in Dockerized Omeka?

Has anyone successfully implemented SolrSearch in a Docker stack of containers?  

I have MariaDB running as one container, Omeka in another, and Solr in a third.  All the pieces seem to be happy together (no errors or warnings of consequence) but I can't get SolrSearch to index any content...it's as though it can't find any documents to process. 