Elasticsearch NEST client ReindexOnServer type problem - elasticsearch

Question

Basically I want to rewrite this code:
var values = "{\"source\":{\"index\": \"" + oldIndex.Index + "\",\"type\": \"" + MyType+ "\"},"
+ "\",\"size\": \"" + size + "\"},"
+ "\"dest\": {\"index\": \"" + tempIndex + "\",\"type\": \"_doc\"}}";
var result = this.httpClient.PostAsync(ReIndexUrl, new StringContent(values, System.Text.Encoding.UTF8, "application/json")).Result;
var response = result.Content.ReadAsStringAsync().Result;
to NEST client:
var response = elasticClient.ReindexOnServer(
r => r
.Source(
s => s
.Index(sourceIndex)
)
.Destination(
d => d
.Index(targetIndex)
).Refresh(false).Size(maximumDocuments)
.WaitForCompletion()
);
While reindexing docs from V6 to V7 using NEST version, I get errors because of duplicate types on the target:
java.lang.IllegalArgumentException: Rejecting mapping update to [audit-trail-2020-04-temp] as the final mapping would have more than 1 type: [_doc, audittrailentry]
I cannot find a way to workaround this issue using NEST since there is no way to exclude type?

Answer 1

Unfortunately, I dit not find a solution for this using NEST Client.
At the end I wrote my own extension:
internal static long ReIndex(this IElasticClient elasticClient, ReindexModel reindexModel)
{
elasticClient.DisableRefreshing(reindexModel.SourceIndex);
var result = HttpClient.PostAsync(ReIndexUrl, new StringContent(JsonConvert.SerializeObject(reindexModel.Value), Encoding.UTF8, "application/json")).Result;
var response = result.Content.ReadAsStringAsync().Result;
var responseObj = JsonConvert.DeserializeObject<ReindexResponse>(response);
return responseObj.Total;
}
internal class ReindexModel
{
public ReindexModel(string sourceIndex, string targetIndex, string docType, int maxBulkSize)
{
this.SourceIndex = sourceIndex;
this.TargetIndex = targetIndex;
this.DocType = docType;
this.Value = new { source = new { index = this.SourceIndex, type = this.DocType, size = maxBulkSize }, dest = new { index = this.TargetIndex, type = "_doc" } };
}
public object Value { get; }
public string SourceIndex { get; }
public string TargetIndex { get; }
private string DocType { get; }
}
internal class ReindexResponse
{
[JsonProperty]
public long Total { get; set; }
}