Description
Just took Solr 9.2.1 try to enable echo on /update/json/docs it returns empty docs.
At glance it looks like due to
org.apache.solr.common.util.JsonRecordReader.Handler#handle expects copy of incoming map, but org.apache.solr.handler.loader.JsonLoader.SingleThreadedJsonLoader#getDocMap doesn't makes a copy.
Then that map is wiped in finally block at org/apache/solr/common/util/JsonRecordReader.java:440