[FINNA-3637] Split merging of component parts to its own method#178

EreMaijala merged 4 commits intoNatLibFi:devNatLibFi/RecordManager:devfrom

LuomaJuha:split-component-part-merge-in-solr-updaterLuomaJuha/RecordManager:split-component-part-merge-in-solr-updaterCopy head branch name to clipboard