Cores in Solr (Multicore Solr)
Solr cores make it possible to run multiple indexes with different configurations and schemas in a single Solr instance. The multicore feature of Solr helps in unified administration of Solr instances for complete and different applications. Cores in Solr are fairly isolated and have their own configuration and schema files. This helps manage cores at runtime (create or remove) from a Solr instance without restarting the process.
Cores in Solr are managed through a configuration file called solr.xml. The solr.xml file is present in your Solr Home directory. Since its inception, solr.xml has evolved from configuring one core to managing multiple cores and eventually defining parameters for SolrCloud. Do not worry much ...
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