do not create solr-home if there is no template to compy into that directory (need to be able to create it later if/when someone decides to use and deploy metacat-index). https://projects.ecoinformatics.org/ecoinfo/issues/6006
do not attempt to copy solr-home template from metacat-index webapp if it does not exist. This would be in cases where metacat-index is not deployed. https://projects.ecoinformatics.org/ecoinfo/issues/6006
Solr will be enabled if it is in the db.enabledEngines.
do not require PortalCertificateManager be configured. Fix NPE because session was not created when using old sessionid-based authentication. https://projects.ecoinformatics.org/ecoinfo/issues/5942
handle client certificates, portal certificates and jsessionid as three ways to prove you are an uthenticated user. https://projects.ecoinformatics.org/ecoinfo/issues/5942
Use some contants from the EnabledQueryEngines.
Updated documentation, and added modification date to the sitemap index file entries.
Remove unused import.
Mofdified Sitemap class to also generate the sitemap index file that is needed when more than one sitemap file is provided.
use ContentTypeInputStream interface (and ByteArray implementation) to specify the desired content-type of the InputStream returned by MN.query().
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