fix bulk removing items from elasticsearch index (#1374)

ErsatzTV.Infrastructure/Search/ElasticSearchIndex.cs

@@ -41,7 +41,7 @@ public class ElasticSearchIndex : ISearchIndex
 
     public async Task<bool> IndexExists()
     {
-        _client ??= new ElasticsearchClient(Uri);
+        _client ??= CreateClient();
         ExistsResponse exists = await _client.Indices.ExistsAsync(IndexName);
         return exists.IsValidResponse;
     }
@@ -52,7 +52,8 @@ public class ElasticSearchIndex : ISearchIndex
         ILocalFileSystem localFileSystem,
         IConfigElementRepository configElementRepository)
     {
-        _client ??= new ElasticsearchClient(Uri);
+        _client ??= CreateClient();
+
         ExistsResponse exists = await _client.Indices.ExistsAsync(IndexName);
         if (!exists.IsValidResponse)
         {
@@ -188,6 +189,12 @@ public class ElasticSearchIndex : ISearchIndex
         // do nothing
     }
 
+    private static ElasticsearchClient CreateClient()
+    {
+        ElasticsearchClientSettings settings = new ElasticsearchClientSettings(Uri).DefaultIndex(IndexName);
+        return new ElasticsearchClient(settings);
+    }
+
     private async Task<CreateIndexResponse> CreateIndex() =>
         await _client.Indices.CreateAsync<ElasticSearchItem>(
             IndexName,