Sitecore Docs - Tech Tips by GS

We were using docker based Sitecore 10.1 for local development. This was an upgrade project and I was working on validating the items in upgraded Sitecore 10.1 environment.  Problem I started performing some simple searches in Content Editor's search box but got no results returned even when the item existed in the content tree. I realized I have never built the SOLR indexes since I setup the environment. So I went to control panel and attempted index rebuild. I got the following error -  Job started: Index_Update_IndexName=sitecore_master_index |# Exception : System . Reflection . TargetInvocationException : Exception has been thrown by the target of an invocation. ---> SolrNet . Exceptions . SolrConnectionException : <?xml version="1.0" encoding=" UTF -8"?> <response> <lst name="response Header "> < int name="rf">1< / int > < int name="status">400< / int > < int name=...