title: Failed to bind properties under logging.level.* or someproperty.*=some_value
body: <p>After i migrated from Spring boot 1.5 to 2.x i have the below problem:</p>
  
  <pre><code>APPLICATION FAILED TO START
  
  Description:
  Failed to bind properties under logging.level to java.util.Map&lt;java.lang.String, java.lang.String&gt;:
  
  Reason: No converter found capable of converting from type [java.lang.String] to type [java.util.Map&lt;java.lang.String, java.lang.String&gt;]
  
  Action:
  
  Update your application's configuration
  </code></pre>
  
  <p>In properties I have</p>
  
  <pre><code>logging.level.*=debug
  </code></pre>
  
  <p>It works if I go back to version 1.5.x 
  Can anyone point me in the right way?</p>
  
  <p>UPDATE :
  The same problem happens when I use </p>
  
  <pre><code>someproperty.*=some_value
  </code></pre>
  
  <p>That means the <code>.*=</code> is not supported in SpringBoot 2.0 ?</p>