Source returns instance when an ElasticSearch returns an error

[PaulEpitomy]

Source methods do not handle ElasticSearch error, e.g if an attempt to access and invalid index name

The following test will fail: -

    [Test]
    public void GetInvalidIndexShouldReturnNull()
    {
        const string indexName = "indexthatdoesnotexist";
        var elasticSearchProject = this._client.Source<ElasticsearchProject>(4, indexName);

        Assert.IsNull(elasticSearchProject);
    }

[Mpdreamz]

Thank you @PaulEpitomy this was a huge oversight, thanks for reporting this.