Ok. I understood my problem. Usually I create collection with X shards and then add some Y cores. This Y cores I use like gateways or federators (my web application sends queries to load balancer that connected to Y cores only).
When I create Y cores, I used this command *http://<server_name>:<port>/solr/admin/cores?action=create&name=<collection_name>&shard=<shard_name>* So always I got Y cores with the same name (collection name) and due to CREATESNAPSHOT command doesn't work. Solution is to use something like this if you need to add new cores after creating collection: *http://<server_name>:<port>/solr/admin/cores?action=create&name=<collection_name>_<shard_name>&collection=<collection_name>&shard=<shard_name>* -- Sent from: http://lucene.472066.n3.nabble.com/Solr-User-f472068.html
