Thanks much for the reply. On 2/15/23, 4:12 PM, "Shawn Heisey" <[email protected] <mailto:[email protected]>> wrote:
On 2/14/23 20:02, Natarajan, Rajeswari wrote: > Would like to know if it is possible to upgrade standalone solr from 4.x to > 8.x > > Is there a wiki available. Please let me know. In most cases when jumping more than one major version you will have to completely reindex from scratch. You can't upgrade it step-by-step to one major version at a time, because starting in one of the 6.x versions, the Lucene version that originally wrote each segment is recorded and never gets updated or removed. If a segment has no version or the earliest version recorded is less than 7.0, then 8.x will refuse to open it. 9.x is similar for anything older than 8.0. I have seen a tool that bypasses this version check, allowing upgrades that Lucene prevents. Even if you did use that tool and managed to get it to work, it's a bad idea, which is why it's explicitly blocked. Thanks, Shawn
