Add migrate to data stream API in NEST

src/Nest/Descriptors.Indices.cs

@@ -1000,6 +1000,27 @@ public GetIndexTemplateDescriptor(Names name): base(r => r.Optional("name", name
 		public GetIndexTemplateDescriptor MasterTimeout(Time mastertimeout) => Qs("master_timeout", mastertimeout);
 	}
 
+	///<summary>Descriptor for MigrateToDataStream <para>https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</para></summary>
+	public partial class MigrateToDataStreamDescriptor : RequestDescriptorBase<MigrateToDataStreamDescriptor, MigrateToDataStreamRequestParameters, IMigrateToDataStreamRequest>, IMigrateToDataStreamRequest
+	{
+		internal override ApiUrls ApiUrls => ApiUrlsLookups.IndicesMigrateToDataStream;
+		///<summary>/_data_stream/_migrate/{name}</summary>
+		///<param name = "name">this parameter is required</param>
+		public MigrateToDataStreamDescriptor(Name name): base(r => r.Required("name", name))
+		{
+		}
+
+		///<summary>Used for serialization purposes, making sure we have a parameterless constructor</summary>
+		[SerializationConstructor]
+		protected MigrateToDataStreamDescriptor(): base()
+		{
+		}
+
+		// values part of the url path
+		Name IMigrateToDataStreamRequest.Name => Self.RouteValues.Get<Name>("name");
+	// Request parameters
+	}
+
 	///<summary>Descriptor for Open <para>https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-open-close.html</para></summary>
 	public partial class OpenIndexDescriptor : RequestDescriptorBase<OpenIndexDescriptor, OpenIndexRequestParameters, IOpenIndexRequest>, IOpenIndexRequest
 	{

src/Nest/ElasticClient.Indices.cs

@@ -689,6 +689,30 @@ public Task<GetMappingResponse> GetMappingAsync<TDocument>(Func<GetMappingDescri
 		/// </summary>
 		public Task<GetIndexTemplateResponse> GetTemplateAsync(IGetIndexTemplateRequest request, CancellationToken ct = default) => DoRequestAsync<IGetIndexTemplateRequest, GetIndexTemplateResponse>(request, request.RequestParameters, ct);
 		/// <summary>
+		/// <c>POST</c> request to the <c>indices.migrate_to_data_stream</c> API, read more about this API online:
+		/// <para></para>
+		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html">https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</a>
+		/// </summary>
+		public MigrateToDataStreamResponse MigrateToDataStream(Name name, Func<MigrateToDataStreamDescriptor, IMigrateToDataStreamRequest> selector = null) => MigrateToDataStream(selector.InvokeOrDefault(new MigrateToDataStreamDescriptor(name: name)));
+		/// <summary>
+		/// <c>POST</c> request to the <c>indices.migrate_to_data_stream</c> API, read more about this API online:
+		/// <para></para>
+		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html">https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</a>
+		/// </summary>
+		public Task<MigrateToDataStreamResponse> MigrateToDataStreamAsync(Name name, Func<MigrateToDataStreamDescriptor, IMigrateToDataStreamRequest> selector = null, CancellationToken ct = default) => MigrateToDataStreamAsync(selector.InvokeOrDefault(new MigrateToDataStreamDescriptor(name: name)), ct);
+		/// <summary>
+		/// <c>POST</c> request to the <c>indices.migrate_to_data_stream</c> API, read more about this API online:
+		/// <para></para>
+		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html">https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</a>
+		/// </summary>
+		public MigrateToDataStreamResponse MigrateToDataStream(IMigrateToDataStreamRequest request) => DoRequest<IMigrateToDataStreamRequest, MigrateToDataStreamResponse>(request, request.RequestParameters);
+		/// <summary>
+		/// <c>POST</c> request to the <c>indices.migrate_to_data_stream</c> API, read more about this API online:
+		/// <para></para>
+		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html">https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</a>
+		/// </summary>
+		public Task<MigrateToDataStreamResponse> MigrateToDataStreamAsync(IMigrateToDataStreamRequest request, CancellationToken ct = default) => DoRequestAsync<IMigrateToDataStreamRequest, MigrateToDataStreamResponse>(request, request.RequestParameters, ct);
+		/// <summary>
 		/// <c>POST</c> request to the <c>indices.open</c> API, read more about this API online:
 		/// <para></para>
 		/// <a href = "https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-open-close.html">https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-open-close.html</a>

src/Nest/Requests.Indices.cs

@@ -1800,6 +1800,39 @@ public Time MasterTimeout
 		}
 	}
 
+	[InterfaceDataContract]
+	public partial interface IMigrateToDataStreamRequest : IRequest<MigrateToDataStreamRequestParameters>
+	{
+		[IgnoreDataMember]
+		Name Name
+		{
+			get;
+		}
+	}
+
+	///<summary>Request for MigrateToDataStream <para>https://www.elastic.co/guide/en/elasticsearch/reference/master/data-streams.html</para></summary>
+	public partial class MigrateToDataStreamRequest : PlainRequestBase<MigrateToDataStreamRequestParameters>, IMigrateToDataStreamRequest
+	{
+		protected IMigrateToDataStreamRequest Self => this;
+		internal override ApiUrls ApiUrls => ApiUrlsLookups.IndicesMigrateToDataStream;
+		///<summary>/_data_stream/_migrate/{name}</summary>
+		///<param name = "name">this parameter is required</param>
+		public MigrateToDataStreamRequest(Name name): base(r => r.Required("name", name))
+		{
+		}
+
+		///<summary>Used for serialization purposes, making sure we have a parameterless constructor</summary>
+		[SerializationConstructor]
+		protected MigrateToDataStreamRequest(): base()
+		{
+		}
+
+		// values part of the url path
+		[IgnoreDataMember]
+		Name IMigrateToDataStreamRequest.Name => Self.RouteValues.Get<Name>("name");
+	// Request parameters
+	}
+
 	[InterfaceDataContract]
 	public partial interface IOpenIndexRequest : IRequest<OpenIndexRequestParameters>
 	{

src/Nest/XPack/DataStreams/Migrate/MigrateToDataStreamRequest.cs

@@ -0,0 +1,25 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+namespace Nest
+{
+	/// <summary>
+	/// Converts an index alias to a data stream.
+	/// </summary>
+	[MapsApi("indices.migrate_to_data_stream.json")]
+	[ReadAs(typeof(MigrateToDataStreamRequest))]
+	public partial interface IMigrateToDataStreamRequest
+	{
+	}
+
+	/// <inheritdoc cref="IMigrateToDataStreamRequest"/>
+	public partial class MigrateToDataStreamRequest : IMigrateToDataStreamRequest
+	{
+	}
+
+	/// <inheritdoc cref="IMigrateToDataStreamRequest"/>
+	public partial class MigrateToDataStreamDescriptor
+	{
+	}
+}

src/Nest/XPack/DataStreams/Migrate/MigrateToDataStreamResponse.cs

@@ -0,0 +1,8 @@
+// Licensed to Elasticsearch B.V under one or more agreements.
+// Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information
+
+ namespace Nest
+{
+	public class MigrateToDataStreamResponse : AcknowledgedResponseBase { }
+}

src/Nest/_Generated/ApiUrlsLookup.generated.cs

@@ -134,6 +134,7 @@ internal static class ApiUrlsLookups
 		internal static ApiUrls IndicesGetMapping = new ApiUrls(new[]{"_mapping", "{index}/_mapping"});
 		internal static ApiUrls IndicesGetSettings = new ApiUrls(new[]{"_settings", "{index}/_settings", "{index}/_settings/{name}", "_settings/{name}"});
 		internal static ApiUrls IndicesGetTemplate = new ApiUrls(new[]{"_template", "_template/{name}"});
+		internal static ApiUrls IndicesMigrateToDataStream = new ApiUrls(new[]{"_data_stream/_migrate/{name}"});
 		internal static ApiUrls IndicesOpen = new ApiUrls(new[]{"{index}/_open"});
 		internal static ApiUrls IndicesPutAlias = new ApiUrls(new[]{"{index}/_alias/{name}"});
 		internal static ApiUrls IndicesPutMapping = new ApiUrls(new[]{"{index}/_mapping"});

tests/Tests/XPack/DataStreams/DataStreamsApiTests.cs

@@ -17,7 +17,7 @@ namespace Tests.XPack.DataStreams
 	[SkipVersion("<7.9.0", "Introduced in 7.9.0")]
 	public class DataStreamsApiTests : CoordinatedIntegrationTestBase<WritableCluster>
 	{
-		private static readonly Metric Document = new Metric
+		private static readonly Metric Document = new()
 		{
 			Timestamp = new DateTime(2020, 8, 3, 14, 0, 0, DateTimeKind.Utc),
 			Accept = 3,
@@ -27,13 +27,16 @@ public class DataStreamsApiTests : CoordinatedIntegrationTestBase<WritableCluste
 			Response = 300,
 			Total = 3
 		};
-
+		
 		private const string CreateDataStreamStep = nameof(CreateDataStreamStep);
 		private const string IndexStep = nameof(IndexStep);
 		private const string GetDataStreamStep = nameof(GetDataStreamStep);
 		private const string PutIndexTemplateStep = nameof(PutIndexTemplateStep);
 		private const string DataStreamsStatsStep = nameof(DataStreamsStatsStep);
 		private const string DeleteDataStreamStep = nameof(DeleteDataStreamStep);
+		private const string PrepareIndexStep = nameof(PrepareIndexStep);
+		private const string PrepareAliasStep = nameof(PrepareAliasStep);
+		private const string MigrateToDataStreamStep = nameof(MigrateToDataStreamStep);
 
 		public DataStreamsApiTests(WritableCluster cluster, EndpointUsage usage) : base(new CoordinatedUsage(cluster, usage, testOnlyOne: true)
 		{
@@ -89,10 +92,10 @@ public DataStreamsApiTests(WritableCluster cluster, EndpointUsage usage) : base(
 						Refresh = Refresh.WaitFor
 					},
 					(v, d) => d.Index(v).Refresh(Refresh.WaitFor),
-					(v, c, f) => c.Index<Metric>(Document, f),
-					(v, c, f) => c.IndexAsync<Metric>(Document, f),
-					(v, c, r) => c.Index<Metric>(r),
-					(v, c, r) => c.IndexAsync<Metric>(r)
+					(v, c, f) => c.Index(Document, f),
+					(v, c, f) => c.IndexAsync(Document, f),
+					(v, c, r) => c.Index(r),
+					(v, c, r) => c.IndexAsync(r)
 				)
 			},
 			{GetDataStreamStep, u =>
@@ -125,6 +128,48 @@ public DataStreamsApiTests(WritableCluster cluster, EndpointUsage usage) : base(
 					(v, c, r) => c.Indices.DeleteDataStreamAsync(r)
 				)
 			},
+			// Used for migrate step
+			{PrepareIndexStep, ">= 7.13.0", u =>
+				u.Calls<CreateIndexDescriptor, CreateIndexRequest, ICreateIndexRequest, CreateIndexResponse>(
+					v => new CreateIndexRequest($"my-index{v}-test")
+					{
+						Mappings = new TypeMapping
+						{
+							Properties = new Properties
+							{
+								{ "@timestamp", new DateNanosProperty() }
+							}
+						}
+					},
+					(v, d) => d.Map(m=> m.Properties(p=> p.DateNanos(dn => dn.Name("@timestamp")))),
+					(v, c, f) => c.Indices.Create($"my-index{v}-test", f),
+					(v, c, f) => c.Indices.CreateAsync($"my-index{v}-test", f),
+					(v, c, r) => c.Indices.Create(r),
+					(v, c, r) => c.Indices.CreateAsync(r)
+				)
+			},
+			// Used for migrate step
+			{PrepareAliasStep,">= 7.13.0", u =>
+				u.Calls<PutAliasDescriptor, PutAliasRequest, IPutAliasRequest, PutAliasResponse>(
+					v => new PutAliasRequest($"my-index{v}-test", $"{v}-alias"),
+					(v, d) => d,
+					(v, c, f) => c.Indices.PutAlias($"my-index{v}-test", $"{v}-alias", f),
+					(v, c, f) => c.Indices.PutAliasAsync($"my-index{v}-test", $"{v}-alias", f),
+					(v, c, r) => c.Indices.PutAlias(r),
+					(v, c, r) => c.Indices.PutAliasAsync(r)
+				)
+			},
+			// Migrate to data stream added in 7.13.0
+			{MigrateToDataStreamStep,">= 7.13.0", u =>
+				u.Calls<MigrateToDataStreamDescriptor, MigrateToDataStreamRequest, IMigrateToDataStreamRequest, MigrateToDataStreamResponse>(
+					v => new MigrateToDataStreamRequest($"{v}-alias"),
+					(v, d) => d,
+					(v, c, f) => c.Indices.MigrateToDataStream($"{v}-alias", f),
+					(v, c, f) => c.Indices.MigrateToDataStreamAsync($"{v}-alias", f),
+					(v, c, r) => c.Indices.MigrateToDataStream(r),
+					(v, c, r) => c.Indices.MigrateToDataStreamAsync(r)
+				)
+			},
 		}) { }
 
 		[I] public async Task CreateDataStreamResponse() => await Assert<CreateDataStreamResponse>(CreateDataStreamStep, (v, r) =>
@@ -179,5 +224,11 @@ [I] public async Task DeleteDataStreamResponse() => await Assert<DeleteDataStrea
 			r.ShouldBeValid();
 			r.Acknowledged.Should().BeTrue();
 		});
+
+		[I] public async Task MigrateToDataStreamResponse() => await Assert<MigrateToDataStreamResponse>(MigrateToDataStreamStep, r =>
+		{
+			r.ShouldBeValid();
+			r.Acknowledged.Should().BeTrue();
+		});
 	}
 }

tests/Tests/XPack/DataStreams/Migrate/MigrateToDataStreamUrlTests.cs

@@ -0,0 +1,18 @@
+using System.Threading.Tasks;
+using Elastic.Elasticsearch.Xunit.XunitPlumbing;
+using Nest;
+using Tests.Framework.EndpointTests;
+using static Tests.Framework.EndpointTests.UrlTester;
+
+namespace Tests.XPack.DataStreams.Migrate
+{
+	public class MigrateToDataStreamUrlTests : UrlTestsBase
+	{
+		[U]
+		public override async Task Urls() => await POST("/_data_stream/_migrate/stream")
+			.Fluent(c => c.Indices.MigrateToDataStream("stream", f => f))
+			.Request(c => c.Indices.MigrateToDataStream(new MigrateToDataStreamRequest("stream")))
+			.FluentAsync(c => c.Indices.MigrateToDataStreamAsync("stream", f => f))
+			.RequestAsync(c => c.Indices.MigrateToDataStreamAsync(new MigrateToDataStreamRequest("stream")));
+	}
+}