title: Nifi LookupAttribute processor with SimpleCsvFileLookupService doesn't work
body: <p>I'd like to use a CSV file as a lookup table to update some attributes.</p>
  <p>So I figured the <em>LookUpAttribute</em> processor was what I needed. I configured it with as <em>SimpleCsvFileLookupService</em> as the Lookup Service, but I can't get it to work yet.</p>
  <p>My <em>SimpleCsvFileLookupService</em> is configured but stays in a &quot;enabling&quot; state, and the <em>LookUpAttribute</em> processor still tells me it's &quot;invalid because performing validation depends on referencing a Controller Service that is currently disabled&quot;.</p>
  <p>I dont understand why it doesn't enable. Has somebody used these components ? Thx</p>
  <p><a href="https://i.stack.imgur.com/UjWbG.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UjWbG.png" alt="Dataflow" /></a>
  <a href="https://i.stack.imgur.com/Jtwgd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Jtwgd.png" alt="LookAttribute properties" /></a>
  <a href="https://i.stack.imgur.com/MYZem.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MYZem.png" alt="Controller services" /></a></p>
  <p><strong>Edit</strong> :
  I didn't see the message in the left. It says the mapping for &quot;1&quot; is not found (&quot;1&quot; is set as the lookup key column and in the csv the header row is &quot;1;2;3;4;5;6;7;8&quot;.</p>
  <p>What am I missing ? I can't find any explanation as to how to use this controller service.</p>
  <p><a href="https://i.stack.imgur.com/f5sfe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/f5sfe.png" alt="Controller service warning" /></a></p>
  <p><strong>Edit2</strong> : The SimpleCsvFileLookupService properties
  <a href="https://i.stack.imgur.com/XGRvs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XGRvs.png" alt="SimpleCsvFileLookupService properties" /></a></p>
  <p><strong>Edit3</strong> : Extract of the csv file
  <a href="https://i.stack.imgur.com/F3vTf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/F3vTf.png" alt="csv file" /></a></p>