diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/health.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/health.rb
index 9e66dc9b7..cb1f606f6 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/health.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/health.rb
@@ -35,7 +35,7 @@ module Actions
         #
         # @option arguments [String] :time The unit used to display time values.
         # @option arguments [Boolean] :ts If true, returns `HH:MM:SS` and Unix epoch timestamps. Server default: true.
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/indices.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/indices.rb
index edce15131..5ab9363bd 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/indices.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/indices.rb
@@ -44,7 +44,7 @@ module Actions
         # @option arguments [Boolean] :pri If true, the response only includes information from primary shards.
         # @option arguments [String] :time The unit used to display time values.
         # @option arguments [Time] :master_timeout Period to wait for a connection to the master node. Server default: 30s.
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/master.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/master.rb
index 32d1f3792..13b6fff2d 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/master.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/master.rb
@@ -26,7 +26,7 @@ module Actions
         # Get information about the master node, including the ID, bound IP address, and name.
         # IMPORTANT: cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the nodes info API.
         #
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/nodeattrs.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/nodeattrs.rb
index 7f37d7597..499611b14 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/nodeattrs.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/nodeattrs.rb
@@ -26,7 +26,7 @@ module Actions
         # Get information about custom node attributes.
         # IMPORTANT: cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the nodes info API.
         #
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/pending_tasks.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/pending_tasks.rb
index fd61e80c9..31df5a32d 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/pending_tasks.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/pending_tasks.rb
@@ -26,7 +26,7 @@ module Actions
         # Get information about cluster-level changes that have not yet taken effect.
         # IMPORTANT: cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the pending cluster tasks API.
         #
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/plugins.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/plugins.rb
index 045dee6b2..375243a45 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/plugins.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/plugins.rb
@@ -26,7 +26,7 @@ module Actions
         # Get a list of plugins running on each node of a cluster.
         # IMPORTANT: cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the nodes info API.
         #
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/tasks.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/tasks.rb
index 94cd3370e..84bde3200 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/tasks.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/tasks.rb
@@ -34,7 +34,7 @@ module Actions
         # @option arguments [Boolean] :detailed If `true`, the response includes detailed information about shard recoveries.
         # @option arguments [Array<String>] :nodes Unique node identifiers, which are used to limit the response.
         # @option arguments [String] :parent_task_id The parent task identifier, which is used to limit the response.
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/cat/templates.rb b/elasticsearch-api/lib/elasticsearch/api/actions/cat/templates.rb
index 77b1236f0..653dde596 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/cat/templates.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/cat/templates.rb
@@ -29,7 +29,7 @@ module Actions
         #
         # @option arguments [String] :name The name of the template to return.
         #  Accepts wildcard expressions. If omitted, all templates are returned.
-        # @option arguments [String, Array<String>] :h List of columns to appear in the response. Supports simple wildcards.
+        # @option arguments [String, Array<String>] :h A comma-separated list of columns names to display. It supports simple wildcards.
         # @option arguments [String, Array<String>] :s List of columns that determine how the table should be sorted.
         #  Sorting defaults to ascending and can be changed by setting `:asc`
         #  or `:desc` as a suffix to the column name.
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb
index 07b5ee5f0..6fe37b5c0 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/create_from.rb
@@ -55,7 +55,6 @@ def create_from(arguments = {})
           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]
 
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/indices/simulate_index_template.rb b/elasticsearch-api/lib/elasticsearch/api/actions/indices/simulate_index_template.rb
index 915ba5e90..8ee4bf6b5 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/indices/simulate_index_template.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/indices/simulate_index_template.rb
@@ -42,6 +42,7 @@ module Actions
         # @option arguments [Boolean] :pretty If set to `true` the returned JSON will be "pretty-formatted". Only use
         #  this option for debugging only.
         # @option arguments [Hash] :headers Custom HTTP headers
+        # @option arguments [Hash] :body index_template
         #
         # @see https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-simulate-index-template
         #
@@ -58,7 +59,7 @@ def simulate_index_template(arguments = {})
           arguments = arguments.clone
           headers = arguments.delete(:headers) || {}
 
-          body = nil
+          body = arguments.delete(:body)
 
           _name = arguments.delete(:name)
 
diff --git a/elasticsearch-api/lib/elasticsearch/api/actions/transform/get_node_stats.rb b/elasticsearch-api/lib/elasticsearch/api/actions/transform/get_node_stats.rb
index b5629cd08..b87f76f42 100644
--- a/elasticsearch-api/lib/elasticsearch/api/actions/transform/get_node_stats.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/actions/transform/get_node_stats.rb
@@ -22,7 +22,7 @@ module Elasticsearch
   module API
     module Transform
       module Actions
-        # Retrieves transform usage information for transform nodes.
+        # Retrieves transform usage information for transform nodes
         #
         # @option arguments [Hash] :headers Custom HTTP headers
         #
diff --git a/elasticsearch-api/lib/elasticsearch/api/version.rb b/elasticsearch-api/lib/elasticsearch/api/version.rb
index f0cf8737d..9170c2c7a 100644
--- a/elasticsearch-api/lib/elasticsearch/api/version.rb
+++ b/elasticsearch-api/lib/elasticsearch/api/version.rb
@@ -18,6 +18,6 @@
 module Elasticsearch
   module API
     VERSION = '9.1.2'.freeze
-    ES_SPECIFICATION_COMMIT = 'eeef9c87c1273e5dd3a5a313768bfa6728cd39cc'.freeze
+    ES_SPECIFICATION_COMMIT = 'bc9f508a529ed807271275ff6294a5c2e87bcc99'.freeze
   end
 end