> I believe I am missing something very elementary. The
> following query
> returns zero hits:
> 
> http://localhost:8983/solr/core0/select/?q=testabc

With this URL, you are hitting the RequestHandler defined as <requestHandler 
name="...." default="true" /> in your core0/conf/solrconfig.xml.

> However, using solritas, it finds many results:
> 
> http://localhost:8983/solr/core0/itas?q=testabc

With this one, you are hitting the one registered as <requestHandler 
name="/itas"> 

> Do you have any idea what the issue may be?

Probably they have different default parameters configured. 

For example (e)dismax versus lucene query parser. lucene query parser searches 
testabc in your default field. dismax searches it in all of the fields defined 
in qf parameter.

You can see the full parameter list by appending &echoParams=all to your search 
URL.

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