public BoneLink findBoneLink(String boneName) {
        BoneLink boneLink = boneLinks.get(boneName);
        return boneLink;
    }
Access the BoneLink for the named bone. Returns null if bone is not
linked, or if the control is not added to a spatial.

@param boneName the name of the bone (not null, not empty)
@return the pre-existing BoneLink, or null if not found
jme3-jbullet/src/main/java/com/jme3/bullet/animation/DacLinks.java