diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/cancel_migrate_reindex.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/cancel_migrate_reindex.rb
new file mode 100644
index 0000000000..45cdae60ff
--- /dev/null
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/cancel_migrate_reindex.rb
@@ -0,0 +1,66 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Auto generated from commit dcb1c1df18a84a0182caa631b4577d89a4602cfe
+# @see https://github.com/elastic/elasticsearch-specification
+#
+module Elasticsearch
+  module API
+    module Indices
+      module Actions
+        # Cancel a migration reindex operation.
+        # Cancel a migration reindex attempt for a data stream or index.
+        # This functionality is Experimental and may be changed or removed
+        # completely in a future release. Elastic will take a best effort approach
+        # to fix any issues, but experimental features are not subject to the
+        # support SLA of official GA features.
+        #
+        # @option arguments [String, Array] :index The index or data stream name (*Required*)
+        # @option arguments [Hash] :headers Custom HTTP headers
+        #
+        # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/migrate-data-stream.html
+        #
+        def cancel_migrate_reindex(arguments = {})
+          request_opts = { endpoint: arguments[:endpoint] || 'indices.cancel_migrate_reindex' }
+
+          defined_params = [:index].inject({}) do |set_variables, variable|
+            set_variables[variable] = arguments[variable] if arguments.key?(variable)
+            set_variables
+          end
+          request_opts[:defined_params] = defined_params unless defined_params.empty?
+
+          raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]
+
+          arguments = arguments.clone
+          headers = arguments.delete(:headers) || {}
+
+          body = nil
+
+          _index = arguments.delete(:index)
+
+          method = Elasticsearch::API::HTTP_POST
+          path   = "_migration/reindex/#{Utils.__listify(_index)}/_cancel"
+          params = {}
+
+          Elasticsearch::API::Response.new(
+            perform_request(method, path, params, body, headers, request_opts)
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb
new file mode 100644
index 0000000000..e3292b439e
--- /dev/null
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb
@@ -0,0 +1,72 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Auto generated from commit dcb1c1df18a84a0182caa631b4577d89a4602cfe
+# @see https://github.com/elastic/elasticsearch-specification
+#
+module Elasticsearch
+  module API
+    module Indices
+      module Actions
+        # Create an index from a source index.
+        # Copy the mappings and settings from the source index to a destination index while allowing request settings and mappings to override the source values.
+        # This functionality is Experimental and may be changed or removed
+        # completely in a future release. Elastic will take a best effort approach
+        # to fix any issues, but experimental features are not subject to the
+        # support SLA of official GA features.
+        #
+        # @option arguments [String] :source The source index or data stream name (*Required*)
+        # @option arguments [String] :dest The destination index or data stream name (*Required*)
+        # @option arguments [Hash] :headers Custom HTTP headers
+        # @option arguments [Hash] :body create_from
+        #
+        # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/migrate-data-stream.html
+        #
+        def create_from(arguments = {})
+          request_opts = { endpoint: arguments[:endpoint] || 'indices.create_from' }
+
+          defined_params = [:source, :dest].inject({}) do |set_variables, variable|
+            set_variables[variable] = arguments[variable] if arguments.key?(variable)
+            set_variables
+          end
+          request_opts[:defined_params] = defined_params unless defined_params.empty?
+
+          raise ArgumentError, "Required argument 'body' missing" unless arguments[:body]
+          raise ArgumentError, "Required argument 'source' missing" unless arguments[:source]
+          raise ArgumentError, "Required argument 'dest' missing" unless arguments[:dest]
+
+          arguments = arguments.clone
+          headers = arguments.delete(:headers) || {}
+
+          body = arguments.delete(:body)
+
+          _source = arguments.delete(:source)
+
+          _dest = arguments.delete(:dest)
+
+          method = Elasticsearch::API::HTTP_PUT
+          path   = "_create_from/#{Utils.__listify(_source)}/#{Utils.__listify(_dest)}"
+          params = {}
+
+          Elasticsearch::API::Response.new(
+            perform_request(method, path, params, body, headers, request_opts)
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/get_migrate_reindex_status.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/get_migrate_reindex_status.rb
new file mode 100644
index 0000000000..de308edebc
--- /dev/null
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/get_migrate_reindex_status.rb
@@ -0,0 +1,66 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Auto generated from commit dcb1c1df18a84a0182caa631b4577d89a4602cfe
+# @see https://github.com/elastic/elasticsearch-specification
+#
+module Elasticsearch
+  module API
+    module Indices
+      module Actions
+        # Get the migration reindexing status.
+        # Get the status of a migration reindex attempt for a data stream or index.
+        # This functionality is Experimental and may be changed or removed
+        # completely in a future release. Elastic will take a best effort approach
+        # to fix any issues, but experimental features are not subject to the
+        # support SLA of official GA features.
+        #
+        # @option arguments [String, Array] :index The index or data stream name. (*Required*)
+        # @option arguments [Hash] :headers Custom HTTP headers
+        #
+        # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/migrate-data-stream.html
+        #
+        def get_migrate_reindex_status(arguments = {})
+          request_opts = { endpoint: arguments[:endpoint] || 'indices.get_migrate_reindex_status' }
+
+          defined_params = [:index].inject({}) do |set_variables, variable|
+            set_variables[variable] = arguments[variable] if arguments.key?(variable)
+            set_variables
+          end
+          request_opts[:defined_params] = defined_params unless defined_params.empty?
+
+          raise ArgumentError, "Required argument 'index' missing" unless arguments[:index]
+
+          arguments = arguments.clone
+          headers = arguments.delete(:headers) || {}
+
+          body = nil
+
+          _index = arguments.delete(:index)
+
+          method = Elasticsearch::API::HTTP_GET
+          path   = "_migration/reindex/#{Utils.__listify(_index)}/_status"
+          params = {}
+
+          Elasticsearch::API::Response.new(
+            perform_request(method, path, params, body, headers, request_opts)
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/migrate_reindex.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/migrate_reindex.rb
new file mode 100644
index 0000000000..de5cc44e6a
--- /dev/null
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/migrate_reindex.rb
@@ -0,0 +1,60 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+# Auto generated from commit dcb1c1df18a84a0182caa631b4577d89a4602cfe
+# @see https://github.com/elastic/elasticsearch-specification
+#
+module Elasticsearch
+  module API
+    module Indices
+      module Actions
+        # Reindex legacy backing indices.
+        # Reindex all legacy backing indices for a data stream.
+        # This operation occurs in a persistent task.
+        # The persistent task ID is returned immediately and the reindexing work is completed in that task.
+        # This functionality is Experimental and may be changed or removed
+        # completely in a future release. Elastic will take a best effort approach
+        # to fix any issues, but experimental features are not subject to the
+        # support SLA of official GA features.
+        #
+        # @option arguments [Hash] :headers Custom HTTP headers
+        # @option arguments [Hash] :body reindex
+        #
+        # @see https://www.elastic.co/guide/en/elasticsearch/reference/current/migrate-data-stream.html
+        #
+        def migrate_reindex(arguments = {})
+          request_opts = { endpoint: arguments[:endpoint] || 'indices.migrate_reindex' }
+
+          raise ArgumentError, "Required argument 'body' missing" unless arguments[:body]
+
+          arguments = arguments.clone
+          headers = arguments.delete(:headers) || {}
+
+          body = arguments.delete(:body)
+
+          method = Elasticsearch::API::HTTP_POST
+          path   = "_migration/reindex"
+          params = {}
+
+          Elasticsearch::API::Response.new(
+            perform_request(method, path, params, body, headers, request_opts)
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/elasticsearch-api/spec/unit/actions/indices/indices_migrate_spec.rb b/elasticsearch-api/spec/unit/actions/indices/indices_migrate_spec.rb
new file mode 100644
index 0000000000..7a53de9155
--- /dev/null
+++ b/elasticsearch-api/spec/unit/actions/indices/indices_migrate_spec.rb
@@ -0,0 +1,88 @@
+# Licensed to Elasticsearch B.V. under one or more contributor
+# license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright
+# ownership. Elasticsearch B.V. licenses this file to you under
+# the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+require 'spec_helper'
+
+describe 'client.indices' do
+  context 'migrate_reindex' do
+    let(:expected_args) do
+      [
+        'POST',
+        '_migration/reindex',
+        {},
+        {},
+        {},
+        { endpoint: 'indices.migrate_reindex' }
+      ]
+    end
+
+    it 'performs the request' do
+      expect(client_double.indices.migrate_reindex(body: {})).to be_a Elasticsearch::API::Response
+    end
+  end
+
+  context 'get_migrate_reindex_status' do
+    let(:expected_args) do
+      [
+        'GET',
+        '_migration/reindex/foo/_status',
+        {},
+        nil,
+        {},
+        { endpoint: 'indices.get_migrate_reindex_status', defined_params: { index: 'foo' } }
+      ]
+    end
+
+    it 'performs the request' do
+      expect(client_double.indices.get_migrate_reindex_status(index: 'foo')).to be_a Elasticsearch::API::Response
+    end
+  end
+
+  context 'cancel_migrate_reindex' do
+    let(:expected_args) do
+      [
+        'POST',
+        '_migration/reindex/foo/_cancel',
+        {},
+        nil,
+        {},
+        { endpoint: 'indices.cancel_migrate_reindex', defined_params: { index: 'foo' } }
+      ]
+    end
+
+    it 'performs the request' do
+      expect(client_double.indices.cancel_migrate_reindex(index: 'foo')).to be_a Elasticsearch::API::Response
+    end
+  end
+
+  context 'create_from' do
+    let(:expected_args) do
+      [
+        'PUT',
+        '_create_from/foo/bar',
+        {},
+        {},
+        {},
+        { endpoint: 'indices.create_from', defined_params: { source: 'foo', dest: 'bar' } }
+      ]
+    end
+
+    it 'performs the request' do
+      expect(client_double.indices.create_from(body: {}, source: 'foo', dest: 'bar')).to be_a Elasticsearch::API::Response
+    end
+  end
+end