SOLR-6365 lazy loaded components did not have initParams applied

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1646402 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-6115: Add getMergeInstance to CompressingStoredFieldsReader.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1646415 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6787 refactored a method out

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1646419 13f79535-47bb-0310-9956-ffa450edef68