David Smiley created SOLR-16368:
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             Summary: Refactoring: Use SolrClient type instead of overly 
specific subclasses
                 Key: SOLR-16368
                 URL: https://issues.apache.org/jira/browse/SOLR-16368
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: David Smiley
            Assignee: Eric Pugh


There are many references to a specific SolrClient subclass that could simply 
refer to SolrClient generally, or perhaps CloudSolrClient.  This impedes 
switching/migrating to different SolrClient implementations.  A similar 
example: we know it's a bad practice to declare a List as ArrayList even when 
it is one; the idea here with SolrClient is the same.

And furthermore, often times "var solrClient = ..." (or even "var solr = ...") 
is totally adequate in the Solr codebase within a method because the variable 
name adequately communicates the type.  These sorts of changes should happen 
first, and then weaken type references in APIs.



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