Run time issue after upgrading Nest.DLL [Elastic search]

Question

Hello Folks I have updated to Nest.dll from 6.8.1 to 7.17.1  after that i'm getting a runtime issue like below Microsoft.Extensions.Diagnostics.HealthChecks.DefaultHealthCheckService[104] Health check elasticsearch threw an unhandled exception after 0.5423ms System.TypeLoadException: Could not load type 'Nest.IPingResponse' from assembly 'Nest Version=7.0.0.0 Culture=neutral PublicKeyToken=96c599bbe3e70f5d'. at HealthChecks.Elasticsearch.ElasticsearchHealthCheck.CheckHealthAsync(HealthCheckContext context CancellationToken cancellationToken) I have verified in the entire solution i didn't see any reference for older version  and also i did clean and rebuild and nuget cache restore. Please help me to resolve this issue.

Bohdan Stupak · Answer

I'm usually using a low-level library for elasticsearch so I'm not an expert on this. But my guess is that ElasticClient is expected to be singleton as described in this issue https://github.com/elastic/elasticsearch-net/issues/4018 and in you app it's transient or scoped so it gets disposed

Bohdan Stupak · Answer

Failing healthcheck may suggest two options: 1. Your elasticsearch instance became unresponsive 2. Healthcheck format somehow changes between versions You should verify both of these options. Can you query your elasticsearch instance via rest API?

Madan Shekar · Answer

Hey Bohdan Thakns for your inputs i will work on this. I have one more question for you after upgrading NEST.DLL 6.8 to 7.17.1 i'm getting below runtime exception. if (client.Indices.Exists(IndexName).Exists) at System.Threading.SemaphoreSlim.CheckDispose() at System.Threading.SemaphoreSlim.Wait(Int32 millisecondsTimeout CancellationToken cancellationToken) at System.Threading.SemaphoreSlim.Wait(TimeSpan timeout) at Elasticsearch.Net.RequestPipeline.FirstPoolUsage(SemaphoreSlim semaphore) at Elasticsearch.Net.Transport` 1. Request[TResponse](HttpMethod method String path PostData data IRequestParameters requestParameters) at Elasticsearch.Net.ElasticLowLevelClient.DoRequest[TResponse](HttpMethod method String path PostData data IRequestParameters requestParameters) at Nest.ElasticClient.DoRequest[TRequestTResponse](TRequest p IRequestParameters parameters Action` 2 forceConfiguration) at Nest.NamespacedClientProxy.DoRequest[TRequestTResponse](TRequest p IRequestParameters parameters Action` 2 forceConfiguration) at Nest.Specification.IndicesApi.IndicesNamespace.Exists(IIndexExistsRequest request) at Nest.Specification.IndicesApi.IndicesNamespace.Exists(Indices index Func` 2 selector) Please share your thoughts on this.