Hoss Man created SOLR-6867:
------------------------------

             Summary: bin/solr -e foo should use collection/cores api to check 
if collection/core exists before trying to create it
                 Key: SOLR-6867
                 URL: https://issues.apache.org/jira/browse/SOLR-6867
             Project: Solr
          Issue Type: Improvement
            Reporter: Hoss Man


currently if you run an example command and the core/collection being created 
already exists you get an error message in the console, ut then the example 
keeps working (see below).

I think it would be better if the script used the cores api (or collection api 
in the 'cloud' example) to check if the collection already existed, and if so 
just output a note about it, something like...

{noformat}
Core API indicates a core named 'techproducts' already exists...
http://localhost:8983/solr/admin/cores?action=status&core=techproducts

To remove this core, use the following command...
  bin/solr ...etc...
And then you can recreate it with...
  bin/solr ...etc...
{noformat}

----

Current behavior...

{noformat}
...
Creating new core 'techproducts' using command:

http://localhost:8983/solr/admin/cores?action=CREATE&name=techproducts&instanceDir=techproducts

Exception in thread "main" org.apache.solr.client.solrj.SolrServerException: 
Request to 
http://localhost:8983/solr/admin/cores?action=CREATE&name=techproducts&instanceDir=techproducts
 failed due to: Core with name 'techproducts' already exists.
        at org.apache.solr.util.SolrCLI.getJson(SolrCLI.java:473)
        at org.apache.solr.util.SolrCLI.getJson(SolrCLI.java:416)
        at org.apache.solr.util.SolrCLI.getJson(SolrCLI.java:402)
        at 
org.apache.solr.util.SolrCLI$CreateCoreTool.runTool(SolrCLI.java:1274)
        at org.apache.solr.util.SolrCLI.main(SolrCLI.java:185)
Indexing tech product example docs from 
/home/hossman/lucene/5x_dev/solr/example/exampledocs
SimplePostTool version 1.5
Posting files to base url http://localhost:8983/solr/techproducts/update using 
content-type application/xml..
...
{noformat}






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