1、在写关键词推荐时，需要把当前文章过滤掉，不能再推荐自己的文章，所以再es中需要用到

MustNot属性查询

/// <summary>
    /// 服务中心es检索
    /// </summary>
    /// <param name="input"></param>
    /// <returns></returns>
    public async Task<PagedDto<ThreePartServiceSearchOutput>> GetThreePartServiceSercahPagedAsync(ThreePartServiceSearchInput input)
    {
        var searchRequest = new SearchRequest<ThreePartServiceIndex>(Nest.Indices.Parse(IndexConsts.ThreePartServiceIndexName));
        FieldSort sort = null;
        if (!input.KeyWords.IsNullOrWhiteSpace())
        {
            sort = new FieldSort { Field = Infer.Field<ThreePartServiceIndex>(d => d.ReleaseTime), Order = SortOrder.Descending };
        }
        else
        {
            sort = new FieldSort {