default boolean isEnabled() {
        return getAsBoolean(HasEnableUtil.ENABLED).orElse(HasEnableUtil.ENABLED_DEFAULT);
    }
Returns if this document is enabled. The alias is a boolean value located 
under the {@link HasEnableUtil#ENABLED} key.

@return  {@code true} if enabled, else {@code false}
runtime-parent/runtime-config/src/main/java/com/speedment/runtime/config/trait/HasEnabled.java