Custom predicate building when filtering Kendo UI MVC Grid

I'm using Kendo UI for ASP.NET MVC with server wrappers.

IQueryable extension method ToDataSourceResult currently creates query like

 myQuery.Where(x=>x.SearchField.Contains(searchString))

when using Contains operator for filtering.

Unfortunately I'm using no-sql database RavenDb and its linq provider doesn't support contains method. Instead it offers extension for IQueryable called Search. So when doing full-text search I should write

 myQuery.Search(x=>x.SearchField, searchString)

instead Where clause. That's why I'm curious is there any opportunity to override default predicate builder? Right now I'm doing it so (it's very basic implementation):

   public static IQueryable<TEntity> ApplyFiltering<TEntity>(this IQueryable<TEntity> queryable, IList<IFilterDescriptor> filters) where TEntity:class
    {
        foreach (var filter in filters.Cast<FilterDescriptor>()){

            var pe = Expression.Parameter(typeof(TEntity), "x");
            var left = Expression.Property(pe, typeof(TEntity).GetProperty(filter.Member));
            queryable = queryable.Search(Expression.Lambda<Func<TEntity, object>>(left, new ParameterExpression[] { pe }), filter.Value.ToString());
        }
        filters.Clear();

        return queryable;
    }

//And controller code:

    public ActionResult Data_Read([DataSourceRequest] DataSourceRequest request)
    {
            var query = repository.GetQueryable();
            query = query.ApplyFilters(request.Filters);
            return Json(query.ToDataSourceResult(request));
    }

Is it correct workaround? Or there is more obvious solution that I couldn't find in docs?