private boolean fieldImplicitlyWordMatch(ImmutableSDField field) {
        // numeric types should not trigger exact-match query parsing
        if (field.getDataType().getPrimitiveType() instanceof NumericDataType) return false;
        // Tensor type should not trigger exact-match query parsing
        if (field.getDataType() instanceof TensorDataType) return false;

        return (! field.hasIndex()
                && !field.getAttributes().isEmpty()
                && field.getIndices().isEmpty()
                && !field.getMatching().isTypeUserSet());
    }
Fields that derive to attribute(s) and no indices should use the WORD indexing form,
in a feeble attempt to match the most peoples expectations as closely as possible.

@author Vegard Havdal
config-model/src/main/java/com/yahoo/schema/processing/AttributesImplicitWord.java