Solr-8.1.0 uses much more memory

[Joe Doupnik]

    Comparing memory consumption (real, not virtual) of quiesent Solr 
v8.0 and prior with Solr v8.1.0 reveals the older versions use about 
1.6GB on my systems but v8.1.0 uses 4.5 to 5+GB. Systems used are SUSE 
Linux, with Oracle JDK v1.8 and openjdk v10. This is a major memory 
consumption issue. I have seen no mention of it in the docs nor forums.
    Thanks,
    Joe D.