Fix MultiSearch functionality (#8176) (#8178)

- Implement `IStreamSerializable` for array request descriptors
- Do not automatically infer index for optional `Indices` parameters

Co-authored-by: Florian Bernd <git@flobernd.de>

Author: github-actions[bot]

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/AsyncSearch/SubmitAsyncSearchRequest.g.cs

@@ -958,7 +958,7 @@ public SubmitAsyncSearchRequestDescriptor(Elastic.Clients.Elasticsearch.Serverle
 	{
 	}
 
-	public SubmitAsyncSearchRequestDescriptor() : this(typeof(TDocument))
+	public SubmitAsyncSearchRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/Cluster/HealthRequest.g.cs

@@ -186,7 +186,7 @@ public HealthRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indices?
 	{
 	}
 
-	public HealthRequestDescriptor() : this(typeof(TDocument))
+	public HealthRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/CountRequest.g.cs

@@ -225,7 +225,7 @@ public CountRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indices?
 	{
 	}
 
-	public CountRequestDescriptor() : this(typeof(TDocument))
+	public CountRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/FieldCapsRequest.g.cs

@@ -161,7 +161,7 @@ public FieldCapsRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indic
 	{
 	}
 
-	public FieldCapsRequestDescriptor() : this(typeof(TDocument))
+	public FieldCapsRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/ClearCacheRequest.g.cs

@@ -142,7 +142,7 @@ public ClearCacheRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indi
 	{
 	}
 
-	public ClearCacheRequestDescriptor() : this(typeof(TDocument))
+	public ClearCacheRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/ExistsAliasRequest.g.cs

@@ -109,7 +109,7 @@ public ExistsAliasRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Ind
 	{
 	}
 
-	public ExistsAliasRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Names name) : this(typeof(TDocument), name)
+	public ExistsAliasRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Names name) : base(r => r.Required("name", name))
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/FlushRequest.g.cs

@@ -120,7 +120,7 @@ public FlushRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indices?
 	{
 	}
 
-	public FlushRequestDescriptor() : this(typeof(TDocument))
+	public FlushRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/ForcemergeRequest.g.cs

@@ -142,7 +142,7 @@ public ForcemergeRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indi
 	{
 	}
 
-	public ForcemergeRequestDescriptor() : this(typeof(TDocument))
+	public ForcemergeRequestDescriptor()
 	{
 	}
 

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/GetAliasRequest.g.cs

@@ -117,10 +117,6 @@ public GetAliasRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Indice
 	{
 	}
 
-	public GetAliasRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Names? name) : this(typeof(TDocument), name)
-	{
-	}
-
 	public GetAliasRequestDescriptor()
 	{
 	}

src/Elastic.Clients.Elasticsearch.Serverless/_Generated/Api/IndexManagement/GetIndicesSettingsRequest.g.cs

@@ -150,10 +150,6 @@ public GetIndicesSettingsRequestDescriptor(Elastic.Clients.Elasticsearch.Serverl
 	{
 	}
 
-	public GetIndicesSettingsRequestDescriptor(Elastic.Clients.Elasticsearch.Serverless.Names? name) : this(typeof(TDocument), name)
-	{
-	}
-
 	public GetIndicesSettingsRequestDescriptor()
 	{
 	}