Removing a field using TemplateTransformer
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                 Key: SOLR-3189
                 URL: https://issues.apache.org/jira/browse/SOLR-3189
             Project: Solr
          Issue Type: Improvement
          Components: contrib - DataImportHandler
            Reporter: Luca Cavanna
            Priority: Minor


While importing documents through DataImportHandler I need to remove some 
fields from the final SolrDocument before it's submitted to Solr.
My usecase: the import query returns an A column which I use to fill in the B 
field on the Solr instance. My Solr schema contains both the A and B fields, so 
they are both filled in through dih. I'd like to force the deletion of A from 
the generated SolrDocument since I need a value only on the B field and want to 
leave empty the A field. The only way I found is using ScriptTransformer, so I 
thought it could be useful to add this feature to the TemplateTransformer.

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