title: neo4j how to drop all constraints
body: <p>Is there a cypher command to drop all constraints? </p>
  
  <p>I know I can drop specific constraints.</p>
  
  <pre><code>DROP CONSTRAINT ON (book:Book) ASSERT book.isbn IS UNIQUE
  </code></pre>
  
  <p>However I want to clear <em>all</em> constraints as part of teardown after testing. Can't find anything in the docs, but something like:</p>
  
  <pre><code>DROP CONSTRAINT *
  </code></pre>
  
  <hr>
  
  <p>Update: My testing setup.</p>
  
  <p>Writing a tiny promise-based nodejs cypher client. I want to test defining unique indexes in application code. </p>