export interface EntitySchemaIndex {
    /**
     * Index column names.
     */
    columns: string[];
    /**
     * Indicates if this index must be unique or not.
     */
    unique: boolean;
    /**
     * If true, the index only references documents with the specified field.
     * These indexes use less space but behave differently in some situations (particularly sorts).
     * This option is only supported for mongodb database.
     */
    sparse?: boolean;
}