SOLR-11508: core.properties should be stored $solr.data.home/core_name #278
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I ended up simply defaulting coreRootDirectory to solr.data.home, if it is defined, and solr.home.home otherwise.
Both values seem somewhat redundant but comments in SOLR-6671 indicate that others have reasons to keep them separate. This patch simply makes Solr behave in a way that is more intuitive by default.
Those who need to revert to the old way can define coreRootDirectory in solr.xml, if they hadn't already.