Hello @ganeshkumarj    Thanks for using Cloudera Community. Based on the Post, You are migrating from Cloudera Search (CDH 5.9.3) to Standalone Solr (Apache v4.10.3). As your Team mentioned, the Error points to Index (Copied manually) being on a Lucene Version higher than anticipated [1].    Your Team can confirm the LuceneVersion via "solrconfig.xml" for the Collection "sample_collection" on CDH. If LuceneVersion Match isn't feasible, ReIndexing is the Only Way forward. Yet, there are few things wherein our help in this Post would be limited: (I) CDH v5.9.3 is EoS since a long time. Internally, We have extremely limited Setup for checking further on your Team's concerns.  (II) Your Team is implementing the Migration on Standalone Solr (Apache v4.10.3). Cloudera Product Offering package Solr into Search (In CDH) & Solr (In CDP). Unfortunately, We have limited input on any Open Source Implementation outside of Cloudera Product.    Our Team would be happy to assist your Team to Migrate from CDH v5.9.3 to CDP, if required by your Team. We have Documentation (Which are Tested internally) to migrate from CDH Search to CDP Solr & your Team would get the Support assistance in any issues as well.    Regards, Smarak   [1] https://lucene.apache.org/core/7_1_0/core/org/apache/lucene/index/IndexFormatTooNewException.html   ... View more