How to configure Solr for improved indexing speed

Question

I have a client program which generates a 1-50 millions Solr documents and add them to Solr.
I\'m using ConcurrentUpdateSolrServer for pushing the documents from the client,

Answer 1

In addition to what was written above, when using SolrCloud, you may want to consider using the CloudSolrClient when using SolrJ. The CloudSolrClient client class is Zookeeper aware and is able to directly connect to the leader shard speeding up the indexing in some cases.