title: Liferay DXP (7.0) refuses to reindex
body: <p>I'm working on a portal where I'm responsible for the searching. I'm using for example JournalArticleIndexerPostProcessor, to add custom fields in the index... </p>
  
  <p>After reindexing a lot of data (full - reindex), I noticed my code was being stale / stuck, and I've kill -9'd the tomcat service. (Locally off course). Not a good plan, since I've rebooted tomcat, cleaned work / temp / state etc, I'm not able to reindex the portal anymore.</p>
  
  <p>I press on the button: Reindex all... Nothing happens.. I press Reindex JournalArticles.. I see something is happening.. But in ElasticSearch, nothing seems to happen. </p>
  
  <p>Advice? I've got this once before, and I just reverted my local setup. But that's a lot of work.. Is there something stale in the database?</p>