Add querygroup lifecycle api documentation

_tuning-your-cluster/availability-and-recovery/workload-management/query-group-lifecycle-api.md

@@ -0,0 +1,121 @@
+---
+layout: default
+title: Query group lifecycle API
+nav_order: 20
+parent: Workload management
+grand_parent: Availability and recovery
+---
+
+# Query Group Lifecycle API
+
+The Query Group Lifecycle API in creates, updates, retrieves, and deletes query groups. The API categorizes queries into specific groups, called _query groups_ based on desired resource limits.
+
+## Paths and HTTP method
+
+```json
+PUT _wlm/query_group
+PUT _wlm/query_group/<name>
+GET _wlm/query_group
+GET _wlm/query_group/<name>
+DELETE _wlm/query_group/<name>
+```
+
+## Request body fields
+
+| Field | Description	 |
+| :--- | :--- |
+| `_id`  | The ID of the query group, which can be used to associate query requests with the group and enforce the group's resource limits.  |
+| `name`  | The name of the query group. |
+| `resiliency_mode`  | The resiliency mode of the query group. Valid modes are `enforced`, `soft`, and `monitor`. For more information about resiliency modes, see [Operating modes](https://opensearch.org/docs/latest/tuning-your-cluster/availability-and-recovery/workload-management/wlm-feature-overview/#operating-modes). |
+| `resource_limits` | The resource limits for query requests in the query group. Valid resources are `cpu` and `memory`.  |
+
+When creating a query group, make sure that the sum of the resource limits for a single resource, either `cpu` or `memory`, does not exceed 1.
+
+## Example requests
+
+The following requests show how to use the Query Group Lifecycle API.
+
+### Creating a query group
+
+```json
+PUT _wlm/query_group
+{
+  "name": "analytics",
+  "resiliency_mode": "enforced",
+  "resource_limits": {
+    "cpu": 0.4,
+    "memory": 0.2
+  }
+}
+```
+
+### Updating a query group
+
+```json
+PUT _wlm/query_group/analytics
+{
+  "resiliency_mode": "monitor",
+  "resource_limits": {
+    "cpu": 0.41,
+    "memory": 0.21
+  }
+}
+```
+
+### Getting a query group
+
+```json
+GET _wlm/query_group/analytics
+```
+
+### Deleting a query group
+
+```json
+DELETE _wlm/query_group/analytics
+```
+
+## Example responses
+
+OpenSearch returns responses similar to the following.
+
+### Creating a query group
+
+```json
+{
+  "_id":"preXpc67RbKKeCyka72_Gw",
+  "name":"analytics",
+  "resiliency_mode":"enforced",
+  "resource_limits":{
+    "cpu":0.4,
+    "memory":0.2
+  },
+  "updated_at":1726270184642
+}
+```
+
+### Updating query group
+
+```json
+{
+  "_id":"preXpc67RbKKeCyka72_Gw",
+  "name":"analytics",
+  "resiliency_mode":"monitor",
+  "resource_limits":{
+    "cpu":0.41,
+    "memory":0.21
+  },
+  "updated_at":1726270333804
+}
+```
+
+## Response body fields
+
+| Field | Description	 |
+| :--- | :--- |
+| `_id`  | The ID of the query group. |
+| `name`  | The name of the query group. Required when creating a new query group. |
+| `resiliency_mode`  | The resiliency mode of the query group. |
+| `resource_limits` | The resource limits of the query group. |
+| `updated_at` | The time at which the query group was last updated. |
+
+