@Override
    public boolean equals(Object object) {
        if ( ! super.equals(object)) return false;
        IndexedItem other = (IndexedItem) object;
        if ( ! this.index.equals(other.getIndexName())) return false;
        return true;
    }
Appends the index prefix if necessary
container-search/src/main/java/com/yahoo/prelude/query/IndexedSegmentItem.java