Apache Solr Reference Guide Covering Apache Solr 6.0

will explain why the request failed.
Examples
Input
Delete ConfigSet 'myConfigSet'
http://localhost:8983/solr/admin/configs?action=DELETE&name=myConfigSet
Output
0
170
List ConfigSets
/admin/configs?action=LIST
Fetch the names of the ConfigSets in the cluster.
Examples
Input
http://localhost:8983/solr/admin/configs?action=LIST&wt=json
Output
{
"responseHeader":{
"status":0,
"QTime":203},
"configSets":["myConfigSet1",
"myConfig2"]}
Rule-based Replica Placement
When Solr needs to assign nodes to collections, it can either automatically assign them randomly or the user can
specify a set nodes where it should create the replicas. With very large clusters, it is hard to specify exact node
names and it still does not give you fine grained control over how nodes are chosen for a shard. The user should
be in complete control of where the nodes are allocated for each collection, shard and replica. This helps to
optimally allocate hardware resources across the cluster.
Rule-based replica assignment allows the creation of rules to determine the placement of replicas in the cluster.
In the future, this feature will help to automatically add or remove replicas when systems go down, or when
higher throughput is required. This enables a more hands-off approach to administration of the cluster.
This feature is used in the following instances:
Apache Solr Reference Guide 6.0
605