Solr 7.0.0 -- can it use a 6.5.0 data repository (index)

[Wayne L. Johnson]

I'm testing Solr 7.0.0.  When I start with an empty index, Solr comes up just 
fine, I can add documents and query documents.  However when I start with an 
already-populated set of documents (from 6.5.0), Solr will not start.  The 
relevant portion of the traceback seems to be:
Caused by: java.lang.NullPointerException
        at java.util.Objects.requireNonNull(Objects.java:203)
            ...
        at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479)
        at 
org.apache.solr.index.SlowCompositeReaderWrapper.<init>(SlowCompositeReaderWrapper.java:76)
        at 
org.apache.solr.index.SlowCompositeReaderWrapper.wrap(SlowCompositeReaderWrapper.java:57)
        at 
org.apache.solr.search.SolrIndexSearcher.<init>(SolrIndexSearcher.java:252)
        at org.apache.solr.core.SolrCore.openNewSearcher(SolrCore.java:2034)
        ... 12 more

In looking at the de-compiled code (SlowCompositeReaderWrapper), lines 72-77, 
and it appears that one or more "leaf" files doesn't have a "min-version" set.  
That's a guess.  If so, does this mean Solr 7.0.0 can't read a 6.5.0 index?

Thanks

Wayne Johnson
801-240-4024
wjohnson...@ldschurch.org<mailto:wjohnson...@ldschurch.org>
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