default boolean isUnique() {
        return getAsBoolean(IndexUtil.UNIQUE).orElse(false);
    }
Returns whether or not this index is an {@code UNIQUE} index.
<p>
This property is editable in the GUI through reflection.

@return {@code true} if this index is {@code UNIQUE}
runtime-parent/runtime-config/src/main/java/com/speedment/runtime/config/Index.java