Hi,         Due to some reason, We are planning to migration solr alone from cloudera search to plain solrcloud 4.10.3 (installed 3 solr and 3 zookeeper alone in baremetal).        We are struggling in the migration process. We tried to create/test with one solr collection with same replicas and same no of shards in the plain solrcloud 4.10.3 and copied index data of corresponding shards/replicas to the plain solrcloud 4.10.3      We got with the below error. we were surprised by the below error. because we used same version as we have in Cloudera Search   Caused by: org.apache.lucene.index.IndexFormatTooNewException: Format version is not supported (resource: BufferedChecksumIndex Input(MMapIndexInput(path="/opt/solr-4.10.3/node1/solr/sample_collection_shard1_replica3/data/index.20190911092017197/segm ents_4g8h"))): 4 (needs to be between 0 and 3)     Thanks & Regards, J. Ganesh Kumar. ... View more