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https://issues.apache.org/jira/browse/SOLR-6246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15413719#comment-15413719
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Grant Ingersoll commented on SOLR-6246:
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I've been hitting this as well.  One suggestion that might minimize the impact: 
 close the writer after build.  In analyzing the method usages, we don't seem 
to call the inline/online "add/update" methods anywhere in the code, so there 
really isn't any reason to keep the writer open.  I know in theory Lucene 
supports updating the suggesters, but we aren't using it.  

While closing the writer at the end of the build won't completely eliminate the 
problem (e.g. opening a new searcher while a build is underway), I think it 
could lower the likelihood.

> Core fails to reload when AnalyzingInfixSuggester is used as a Suggester
> ------------------------------------------------------------------------
>
>                 Key: SOLR-6246
>                 URL: https://issues.apache.org/jira/browse/SOLR-6246
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SearchComponents - other
>    Affects Versions: 4.8, 4.8.1, 4.9, 5.0, 5.1, 5.2, 5.3, 5.4
>            Reporter: Varun Thacker
>         Attachments: SOLR-6246-test.patch, SOLR-6246-test.patch, 
> SOLR-6246.patch
>
>
> LUCENE-5477 - added near-real-time suggest building to 
> AnalyzingInfixSuggester. One of the changes that went in was a writer is 
> persisted now to support real time updates via the add() and update() methods.
> When we call Solr's reload command, a new instance of AnalyzingInfixSuggester 
> is created. When trying to create a new writer on the same Directory a lock 
> cannot be obtained and Solr fails to reload the core.
> Also when AnalyzingInfixLookupFactory throws a RuntimeException we should 
> pass along the original message.
> I am not sure what should be the approach to fix it. Should we have a 
> reloadHook where we close the writer?



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