title: Custom options in nutch crawl script not working
body: <p>I was trying to give custom options in <strong><em>bin/crawl</em></strong> script and encountered an issue. I gave a custom config in nutch to ignore external outlinks in my crawl command like :-</p>
  
  <p><strong><em>bin/crawl -i -D elastic.index=test -D db.ignore.external.links=true urls/ CrawlTest/ 3</em></strong></p>
  
  <p>But this is not working. Then I set this property in nutch-site.xml then it is working. </p>
  
  <p>Then I tried to set a custom config to index data to a specific elastic index other than what is given in nutch-site.xml as java option in bin/crawl. To my surprise it is working.
  The command I've used :-</p>
  
  <p><strong><em>bin/crawl -i -D elastic.index=test urls/ CrawlTest/ 3</em></strong></p>
  
  <p>So I would like to know why my first command didn't work ?Am I missing anything. Please help.</p>