Migrate Documents to Another Collection

[alias]

hello
           please help me look this question ,Solr6.3 is the issue of the index 
migration (/admin/collections?Action=MIGRATE), I really do not know how to 
solve the hope that someone will help answer, very grateful


http://lucene.472066.n3.nabble.com/Migrate-Documents-to-Another-Collection-td4318900.html#a4318907