Modiify SLM execute lifecycle to use POST method as opposed to PUT.

Local patch for implementation in elastic/elasticsearch#47061 and subsequent PR elastic/elasticsearch#49233

Author: codebrain

src/CodeGeneration/ApiGenerator/RestSpecification/XPack/slm.execute_lifecycle.json

@@ -9,7 +9,7 @@
         {
           "path":"/_slm/policy/{policy_id}/_execute",
           "methods":[
-            "PUT"
+            "POST","PUT"
           ],
           "parts":{
             "policy_id":{

src/Elasticsearch.Net/Api/RequestParameters/RequestParameters.SnapshotLifecycleManagement.cs

@@ -33,7 +33,7 @@ public class DeleteSnapshotLifecycleRequestParameters : RequestParameters<Delete
 	///<summary>Request options for ExecuteSnapshotLifecycle <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</para></summary>
 	public class ExecuteSnapshotLifecycleRequestParameters : RequestParameters<ExecuteSnapshotLifecycleRequestParameters>
 	{
-		public override HttpMethod DefaultHttpMethod => HttpMethod.PUT;
+		public override HttpMethod DefaultHttpMethod => HttpMethod.POST;
 	}
 
 	///<summary>Request options for GetSnapshotLifecycle <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-get.html</para></summary>

src/Elasticsearch.Net/ElasticLowLevelClient.SnapshotLifecycleManagement.cs

@@ -54,17 +54,17 @@ public TResponse DeleteSnapshotLifecycle<TResponse>(string policyId, DeleteSnaps
 		[MapsApi("slm.delete_lifecycle", "policy_id")]
 		public Task<TResponse> DeleteSnapshotLifecycleAsync<TResponse>(string policyId, DeleteSnapshotLifecycleRequestParameters requestParameters = null, CancellationToken ctx = default)
 			where TResponse : class, IElasticsearchResponse, new() => DoRequestAsync<TResponse>(DELETE, Url($"_slm/policy/{policyId:policyId}"), ctx, null, RequestParams(requestParameters));
-		///<summary>PUT on /_slm/policy/{policy_id}/_execute <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</para></summary>
+		///<summary>POST on /_slm/policy/{policy_id}/_execute <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</para></summary>
 		///<param name = "policyId">The id of the snapshot lifecycle policy to be executed</param>
 		///<param name = "requestParameters">Request specific configuration such as querystring parameters &amp; request specific connection settings.</param>
 		public TResponse ExecuteSnapshotLifecycle<TResponse>(string policyId, ExecuteSnapshotLifecycleRequestParameters requestParameters = null)
-			where TResponse : class, IElasticsearchResponse, new() => DoRequest<TResponse>(PUT, Url($"_slm/policy/{policyId:policyId}/_execute"), null, RequestParams(requestParameters));
-		///<summary>PUT on /_slm/policy/{policy_id}/_execute <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</para></summary>
+			where TResponse : class, IElasticsearchResponse, new() => DoRequest<TResponse>(POST, Url($"_slm/policy/{policyId:policyId}/_execute"), null, RequestParams(requestParameters));
+		///<summary>POST on /_slm/policy/{policy_id}/_execute <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</para></summary>
 		///<param name = "policyId">The id of the snapshot lifecycle policy to be executed</param>
 		///<param name = "requestParameters">Request specific configuration such as querystring parameters &amp; request specific connection settings.</param>
 		[MapsApi("slm.execute_lifecycle", "policy_id")]
 		public Task<TResponse> ExecuteSnapshotLifecycleAsync<TResponse>(string policyId, ExecuteSnapshotLifecycleRequestParameters requestParameters = null, CancellationToken ctx = default)
-			where TResponse : class, IElasticsearchResponse, new() => DoRequestAsync<TResponse>(PUT, Url($"_slm/policy/{policyId:policyId}/_execute"), ctx, null, RequestParams(requestParameters));
+			where TResponse : class, IElasticsearchResponse, new() => DoRequestAsync<TResponse>(POST, Url($"_slm/policy/{policyId:policyId}/_execute"), ctx, null, RequestParams(requestParameters));
 		///<summary>GET on /_slm/policy/{policy_id} <para>https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-get.html</para></summary>
 		///<param name = "policyId">Comma-separated list of snapshot lifecycle policies to retrieve</param>
 		///<param name = "requestParameters">Request specific configuration such as querystring parameters &amp; request specific connection settings.</param>

src/Nest/ElasticClient.SnapshotLifecycleManagement.cs

@@ -61,25 +61,25 @@ internal SnapshotLifecycleManagementNamespace(ElasticClient client): base(client
 		/// </summary>
 		public Task<DeleteSnapshotLifecycleResponse> DeleteSnapshotLifecycleAsync(IDeleteSnapshotLifecycleRequest request, CancellationToken ct = default) => DoRequestAsync<IDeleteSnapshotLifecycleRequest, DeleteSnapshotLifecycleResponse>(request, request.RequestParameters, ct);
 		/// <summary>
-		/// <c>PUT</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
+		/// <c>POST</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
 		/// <para></para>
 		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html">https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</a>
 		/// </summary>
 		public ExecuteSnapshotLifecycleResponse ExecuteSnapshotLifecycle(Id policyId, Func<ExecuteSnapshotLifecycleDescriptor, IExecuteSnapshotLifecycleRequest> selector = null) => ExecuteSnapshotLifecycle(selector.InvokeOrDefault(new ExecuteSnapshotLifecycleDescriptor(policyId: policyId)));
 		/// <summary>
-		/// <c>PUT</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
+		/// <c>POST</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
 		/// <para></para>
 		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html">https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</a>
 		/// </summary>
 		public Task<ExecuteSnapshotLifecycleResponse> ExecuteSnapshotLifecycleAsync(Id policyId, Func<ExecuteSnapshotLifecycleDescriptor, IExecuteSnapshotLifecycleRequest> selector = null, CancellationToken ct = default) => ExecuteSnapshotLifecycleAsync(selector.InvokeOrDefault(new ExecuteSnapshotLifecycleDescriptor(policyId: policyId)), ct);
 		/// <summary>
-		/// <c>PUT</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
+		/// <c>POST</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
 		/// <para></para>
 		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html">https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</a>
 		/// </summary>
 		public ExecuteSnapshotLifecycleResponse ExecuteSnapshotLifecycle(IExecuteSnapshotLifecycleRequest request) => DoRequest<IExecuteSnapshotLifecycleRequest, ExecuteSnapshotLifecycleResponse>(request, request.RequestParameters);
 		/// <summary>
-		/// <c>PUT</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
+		/// <c>POST</c> request to the <c>slm.execute_lifecycle</c> API, read more about this API online:
 		/// <para></para>
 		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html">https://www.elastic.co/guide/en/elasticsearch/reference/current/slm-api-execute.html</a>
 		/// </summary>