Solr对于index的管理是基于Core的概念的，Solr底层是通过lucene来进行index的，每一个逻辑上的要index的业务对象都可以看作是一个core.

<solr persistent="true" sharedLib="lib">
 <cores adminPath="/admin/cores">
  <core name="core0" instanceDir="core0" />
  <core name="core1" instanceDir="core1" />
 </cores>
</solr>

The<solr>tag accepts two attributes:

• persistent- By default,should runtime core manipulation be saved insolr.xmlso that it is available after a restart.

• sharedLib- Path to a directory containing .jar files that are added to the classpath of every core. The path is relative to solr.home (where solr.xml sits)