Add notifications configs API

model/notifications/config.smithy

@@ -0,0 +1,37 @@
+//  SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+structure NotificationsConfig {
+    config_id: String,
+    name: String,
+    config: NotificationsConfigItem
+}
+
+structure NotificationsConfigItem {
+    name: String,
+    description: String,
+    config_type: String,
+    is_enabled: Boolean,
+    slack: SlackItem
+}
+
+structure SlackItem {
+    url: String
+}
+
+structure NotificationsConfigsOutputItem {
+    config_id: String,
+    last_updated_time_ms: Integer,
+    created_time_ms: Integer,
+    config: NotificationsConfigItem
+}
+
+list NotificationsConfigsList {
+    member: NotificationsConfigsOutputItem
+}

model/notifications/configs/operations.smithy

@@ -0,0 +1,33 @@
+//  SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@externalDocumentation(
+    "API Reference": "https://opensearch.org/docs/latest/observing-your-data/notifications/api/"
+)
+
+@xOperationGroup("notifications.configs")
+@xVersionAdded("2.2")
+@readonly
+@suppress(["HttpUriConflict"])
+@http(method: "GET", uri: "/_plugins/_notifications/configs")
+@documentation("Retrieves all notification configurations.")
+operation NotificationsConfigs_Get {
+    input: NotificationsConfigs_Get_Input,
+    output: NotificationsConfigs_Get_Output
+}
+
+@xOperationGroup("notifications.configs")
+@xVersionAdded("2.2")
+@suppress(["HttpUriConflict"])
+@http(method: "POST", uri: "/_plugins/_notifications/configs")
+@documentation("Creates a notification channel configuration.")
+operation NotificationsConfigs_Post {
+    input: NotificationsConfigs_Post_Input,
+    output: NotificationsConfigs_Post_Output
+}

model/notifications/configs/structures.smithy

@@ -0,0 +1,32 @@
+//  SPDX-License-Identifier: Apache-2.0
+//
+//  The OpenSearch Contributors require contributions made to
+//  this file be licensed under the Apache-2.0 license or a
+//  compatible open source license.
+
+$version: "2"
+namespace OpenSearch
+
+@input
+structure NotificationsConfigs_Get_Input {
+}
+
+@output
+structure NotificationsConfigs_Get_Output {
+    start_index: Integer,
+    total_hits: Integer,
+    total_hit_relation: String,
+    config_list: NotificationsConfigsList
+}
+
+@input
+structure NotificationsConfigs_Post_Input {
+    @required
+    @httpPayload
+    content: NotificationsConfig
+}
+
+@output
+structure NotificationsConfigs_Post_Output {
+    config_id: String
+}

model/opensearch.smithy

@@ -295,6 +295,8 @@ service OpenSearch {
         NodesUsage_WithMetric,
         NodesUsage_WithMetricNodeId,
         NodesUsage_WithNodeId,
+        NotificationsConfigs_Get,
+        NotificationsConfigs_Post,
         PatchActionGroup,
         PatchActionGroups,
         PatchAuditConfiguration,