oqtane.framework/Oqtane.Shared/Interfaces/ISearchable.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Oqtane.Models;

namespace Oqtane.Interfaces
{
    public interface ISearchable
    {
        public Task<List<SearchContent>> GetSearchContentsAsync(PageModule pageModule, DateTime lastIndexedOn);
    }
}