Hello, I have gone through Joining collection in SOLR - Part-1 i.e. join with local shard We all are waiting for Part - 2. i.e. Joining collection with multi shard. Part-2 of below link. https://community.cloudera.com/t5/Community-Articles/Joining-Collections-in-SOLR-Part-I/ta-p/246952 As, now SOLR supports multiple collection joining with little bit config in solrconfig.xml file. We love to have an example like in Part-1 to get an idea how we can achieve joining of multiple shard collection.   Please look at below link of SOLR. With 8.6.0 version, it allows multiple shard joining https://solr.apache.org/news.html Also please have a look and search for below string in the link "Join Query Parser Definition in solrconfig.xml" https://solr.apache.org/guide/8_6/other-parsers.html Eagerly waiting for part-2 with an example to join between multiple shards ... View more