public void addIndex(Index index) {
        indices.put(index.getName(), index);
        lowerCase.put(toLowerCase(index.getName()), index);
        if (index.isDefaultPosition()) {
            defaultPosition = index.getName();
        }
    }
A map of all indices in this search definition, indexed by name
container-search/src/main/java/com/yahoo/prelude/SearchDefinition.java