title: New Kubernetes ConfigMap from file - plus sign?
body: <p>Just ran the following command to create a new ConfigMap from a file:<br>
  <code>kubernetes create configmap foo --from-file=foo</code></p>
  
  <p>It gets created successfully.</p>
  
  <p>Now when I run,<br>
  <code>kubernetes get configmaps foo -o yaml</code></p>
  
  <p>I see the following lines in the resulting output:  </p>
  
  <pre><code>apiVersion: v1
  data:
    foo: |+
      VAR1=value1
      VAR2=value2
  </code></pre>
  
  <p><strong>What does the plus sign in this line mean?</strong><br>
  <code>foo: |+</code></p>
  
  <p>It doesn't appear in any of my other ConfigMaps.</p>