// Initialize and register PrefixQueryCommand
        queryCommand = new PrefixQueryCommand();
        queryCommand.register();
    }

    private void setNotAnalyzedFields(final String... fields) {
        Set<String> notAnalyzedFieldSet = new HashSet<>();
        for (String field : fields) {
            notAnalyzedFieldSet.add(field);
        }

        queryFieldConfig.setApiResponseFields(existingApiResponseFields);

        String[] existingNotAnalyzedFields = { "not_analyzed1", "not_analyzed2" };
        queryFieldConfig.setNotAnalyzedFields(existingNotAnalyzedFields);

        // Initialize
        queryFieldConfig.init();

        // Verify that existing fields are not overwritten