https://openjdk.java.net/ 
public interface sun.jvm.hotspot.debugger.cdbg.IndexableFieldIdentifier extends sun.jvm.hotspot.debugger.cdbg.FieldIdentifier
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: sun.jvm.hotspot.debugger.cdbg.IndexableFieldIdentifier
  super_class: java.lang.Object
{
  public abstract int getIndex();
    descriptor: ()I
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "IndexableFieldIdentifier.java"