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https://issues.apache.org/jira/browse/SOLR-6039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987159#comment-13987159
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Shawn Heisey commented on SOLR-6039:
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I had noticed this with a non-cloud distributed search on Solr 4.7. It was
causing problems when trying to figure out why a search wasn't returning
results. I sent the query directly to a shard to get the info, and put the
problem in the mental category of "Report it later when there's time."
> debug=track causes debug=query info to be suprsedd when no results found
> ------------------------------------------------------------------------
>
> Key: SOLR-6039
> URL: https://issues.apache.org/jira/browse/SOLR-6039
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.7
> Reporter: Hoss Man
>
> Shamik Bandopadhyay noted on the mailing list that debugQuery=true wasn't
> returning info about how the query was being parsed in SolrCloud.
> Steps to reproduce...
> * startup a simple 2 shard solr cluster using the example configs
> * Load this URL:
> ** http://localhost:8983/solr/select?q=Foo&debug=query
> ** note that the debug=query causes a debug block including "parsedquery"
> showing "title:foo"
> * Load either of these URLs:
> ** http://localhost:8983/solr/select?q=Foo&debug=query&debug=track
> ** http://localhost:8983/solr/select?q=Foo&debugQuery=true (legacy short hand
> option for enabling all debug options)
> ** Note that the debug block exists, but *only* includes the distributed
> "track" options - the query parsing debugging info is not available
> * index the sample data (java -jar post.jar *.xml)
> * Load either of these URLs:
> ** http://localhost:8983/solr/select?q=Solr&debugQuery=true&fl=id
> ** http://localhost:8983/solr/select?q=Solr&debug=query&debug=track&fl=id
> ** Note that now we have at least one matching doc, and the parsedquery info
> is included in the debug block along with the tracking info
> * Load either of these URLs:
> ** http://localhost:8983/solr/select?q=Solr&debug=query&debug=track&rows=0
> ** http://localhost:8983/solr/select?q=Solr&debug=query&debug=track&rows=0
> ** Note: even though we have a matching doc, since rows=0 prevents it from
> being returned, the parsedquery debug info again no longer works - just the
> track debug info
> ----
> The work around, for people who want don't care about the newer "debug
> tracking" and what the same debug information as pre-4.7, is to enumerate the
> debug options (ie: {{debug=query&debug=timing&debug=results}}) instead of
> relying on the shorthand: {{debugQuery=true}}
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