geopackage-sdk/src/main/java/mil/nga/geopackage/features/index/FeatureIndexManager.java
public boolean isIndexed() {
        boolean indexed = false;
        for (FeatureIndexType type : indexLocationQueryOrder) {
            indexed = isIndexed(type);
            if (indexed) {
                break;
            }
        }
        return indexed;
    }
public boolean isIndexed() {
        boolean indexed = false;
        for (FeatureIndexType type : indexLocationQueryOrder) {
            indexed = isIndexed(type);
            if (indexed) {
                break;
            }
        }
        return indexed;
    }
Determine if the feature table is indexed

@return true if indexed