private void ensureProjectNumbersIsMutable() {
        if (!projectNumbers_.isModifiable()) {
          projectNumbers_ = makeMutableCopy(projectNumbers_);
        }
        bitField0_ |= 0x00000001;
      }
<pre>
Collection of project numbers
</pre>

Protobuf type {@code google.cloud.storageinsights.v1.DatasetConfig.SourceProjects}
java-storageinsights/proto-google-cloud-storageinsights-v1/src/main/java/com/google/cloud/storageinsights/v1/DatasetConfig.java