CoreAdminHandler是用来管理Solr cores的，用来管理一个Solr instance中所有的cores。
1.查看状态STATUS
http://192.168.137.171:8080/solr-cloud/admin/cores?action=STATUS
2.创建Core
| name |
The name of the new core. Same as "name" on the <core> element. |
| instanceDir |
The directory where files for this SolrCore should be stored. Same as instanceDir on the <core> element. |
| config |
(Optional) Name of the config file (solrconfig.xml) relative to instanceDir. |
| schema |
(Optional) Name of the schema file (schema.xml) relative to instanceDir. |
| datadir |
(Optional) Name of the data directory relative to instanceDir. |
| configSet |
(Optional) Name of the configset to use for this core (see Config Sets) |
| collection |
(Optional) The name of the collection to which this core belongs. The default is the name of the core. collection.<param>=<value> causes a property of <param>=<value> to be set if a new collection is being created. Use collection.configName=<configname> to point to the configuration for a new collection. |
| shard |
(Optional) The shard id this core represents. Normally you want to be auto-assigned a shard id. |
| property.name=value |
(Optional) Sets the core property name to value. See core.properties file contents. |
| async |
(Optional) Request ID to track this action which will be processed asynchronously |
(1)增加shard3的第一个replica(指定core名字和目录)
http://192.168.137.171:8080/solr-cloud/admin/cores?action=CREATE&name=myc2_s3_r1&instanceDir=myc2_s3_r1_t&collection=myc2&shard=shard3
(2)增加shard3的第二个replica(指定配置文件)
http://192.168.137.172:8080/solr-cloud/admin/cores?action=CREATE&name=myc2_s3_r2&instanceDir=myc2_s3_r2&collection=myc2&shard=shard3&config=solrconfig2.xml&schema=schema2.xml
(3)新建collection(增加shard1的第一个replica)
http://192.168.137.171:8080/solr-cloud/admin/cores?action=CREATE&name=myc3_s1_r1&instanceDir=myc3_s1_r1&collection=myc3&shard=shard1&configSet=myconf&collection.configName=myconf2
3.刷新core
当core的配置文件有变化时，可以reload一下。采用的是无缝连接方式。
http://192.168.137.171:8080/solr-cloud/admin/cores?action=RELOAD&core=myc3_s1_r1
4.重命名core
http://192.168.137.171:8080/solr-cloud/admin/cores?action=RENAME&core=myc3_s1_r1&other=coreother
5.交换core
交换core的名字，可以把待机core升格为livecore，同时保持可以恢复livecore。
官方示例：http://localhost:8983/solr/admin/cores?action=SWAP&core=core1&other=core0
6.下线core
官方示例：http://localhost:8983/solr/admin/cores?action=UNLOAD&core=core0
7.合并索引
官方示例：
方式1：http://localhost:8983/solr/admin/cores?action=MERGEINDEXES&core=core0&indexDir=/opt/solr/core1/data/index&indexDir=/opt/solr/core2/data/index
方式2：http://localhost:8983/solr/admin/cores?action=mergeindexes&core=core0&srcCore=core1&srcCore=core2
8.切分
官方示例：http://localhost:8983/solr/admin/cores?action=SPLIT&core=core0&targetCore=core1&targetCore=core2
可选参数：
| Parameter |
Description |
Multi-valued |
| core |
The name of the core to be split. |
false |
| path |
The directory path in which a piece of the index will be written. |
true |
| targetCore |
The target Solr core to which a piece of the index will be merged |
true |
| ranges |
A comma-separated list of hash ranges in hexadecimal format |
false |
| split.key |
The key to be used for splitting the index |
false |
| async |
(Optional) Request ID to track this action which will be processed asynchronously |
false |
9.查看请求状态
官方示例：http://localhost:8983/solr/admin/cores?action=REQUESTSTATUS&requestid=1