title: spring.jackson.default-property-inclusion ignored
body: <p>In my Spring Boot/Kotlin project, I am trying to get the JSON converter to ignore null values in my rest controller responses.</p>
  <p>I've tried setting the following in my application.yml:</p>
  <pre><code>  spring:
      jackson:
        default-property-inclusion: non_null
  </code></pre>
  <p>I've also tried providing a <code>@Bean</code> of type <code>Jackson2ObjectMapperBuilder</code> and <code>@ObjectMapper</code> configured with <code>.serializationInclusion(JsonInclude.Include.NON_NULL)</code> but it's still serializing all the null properties.</p>
  <p>Using Spring Boot 2.3.0, Kotlin 1.3.72, AdoptOpenJDK 13</p>