The issue can be reproduced in this way:
- Install SolrCloud with at least 2 nodes
- Install ZooKeeper with at least 2 nodes
- Create 30 cores
- After each core creation, create 20 random generated documents in a random existent core with 2 concurrent threads on all solr nodes (for example, document 1 in core 3 on node 1, document 2 in core 5 on node 1, document 3 in core 3 on node 2, etc...).
- After all cores creation, query each core for all documents and compare insert data with query result
Some documents result in different core than they are created.