}
	return ESSUnknown, "", fmt.Errorf("Unable to get ES Server Version - got INFO response: %v", m)
}

func (c *esClientV7) isAtleastV7() bool {
	return true
}

// createIndex - creates the index if it does not exist.
func (c *esClientV7) createIndex(args ElasticsearchArgs) error {
	res, err := c.Indices.ResolveIndex([]string{args.Index})
	if err != nil {
		return err
	}
	defer res.Body.Close()

	// Constraints
	CreateConstraint(dst interface{}, name string) error
	DropConstraint(dst interface{}, name string) error
	HasConstraint(dst interface{}, name string) bool

	// Indexes
	CreateIndex(dst interface{}, name string) error
	DropIndex(dst interface{}, name string) error
	HasIndex(dst interface{}, name string) bool
	RenameIndex(dst interface{}, oldName, newName string) error

// BuildIndexOptionsInterface build index options interface
type BuildIndexOptionsInterface interface {
	BuildIndexOptions([]schema.IndexOption, *gorm.Statement) []interface{}
}

// CreateIndex create index `name`
func (m Migrator) CreateIndex(value interface{}, name string) error {
	return m.RunWithValue(value, func(stmt *gorm.Statement) error {
		if stmt.Schema == nil {
			return errors.New("failed to get schema")
		}

        final String toIndex = docIndex + "." + new SimpleDateFormat(Constants.DOCUMENT_INDEX_SUFFIX_PATTERN).format(new Date());
        if (searchEngineClient.createIndex(docIndex, toIndex, numberOfShards, autoExpandReplicas, resetDictionaries)) {
            searchEngineClient.admin().cluster().prepareHealth(toIndex).setWaitForYellowStatus().execute(ActionListener.wrap(response -> {

     * @return true if the index was created successfully, false otherwise
     */
    public boolean createIndex(final String index, final String indexName) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return createIndex(index, indexName, fessConfig.getIndexNumberOfShards(), fessConfig.getIndexAutoExpandReplicas(), true);
    }

    /**

	DB.AutoMigrate(&IndexStruct{})

	if err := DB.Migrator().DropIndex(&IndexStruct{}, "Name"); err != nil {
		t.Fatalf("Failed to drop index for user's name, got err %v", err)
	}

	if err := DB.Migrator().CreateIndex(&IndexStruct{}, "Name"); err != nil {
		t.Fatalf("Got error when tried to create index: %+v", err)
	}

	if !DB.Migrator().HasIndex(&IndexStruct{}, "Name") {
		t.Fatalf("Failed to find index for user's name")
	}