Solr资料，

Apache Solr Reference GuideCovering Apache Solr 5.5

https://archive.apache.org/dist/lucene/solr/ref-guide/apache-solr-ref-guide-5.5.pdf

Collections are made up of one or more shards. Shards have one or more replicas. Each replica is a core.   Solr 5.5.1 API   SolrCloud原理介绍  

Creating your first collection (Simple)

 

Solr 5.5.1 solr-solrj API