diff --git a/docs/overlays/elasticsearch-openapi-overlays.yaml b/docs/overlays/elasticsearch-openapi-overlays.yaml
index f7f85da901..ffc1de32dd 100644
--- a/docs/overlays/elasticsearch-openapi-overlays.yaml
+++ b/docs/overlays/elasticsearch-openapi-overlays.yaml
@@ -9,6 +9,8 @@ actions:
     update:
       title: Elasticsearch API
       description: >
+        Elasticsearch provides REST APIs that are used by the UI components and can be called directly to configure and access Elasticsearch features.
+        
         ## Documentation source and versions
         
         This documentation is derived from the `8.x` branch of the [elasticsearch-specification](https://github.com/elastic/elasticsearch-specification) repository.
diff --git a/docs/overlays/elasticsearch-shared-overlays.yaml b/docs/overlays/elasticsearch-shared-overlays.yaml
index 885e7ae97a..aa281bca6e 100644
--- a/docs/overlays/elasticsearch-shared-overlays.yaml
+++ b/docs/overlays/elasticsearch-shared-overlays.yaml
@@ -353,6 +353,17 @@ actions:
         externalDocs:
           url: https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl.html
           description: Query DSL
+  - target: "$.components['schemas']['_global.search._types:FieldCollapse']"
+    description: Add x-model and externalDocs
+    update:
+      x-model: true
+      externalDocs:
+        url: https://www.elastic.co/guide/en/elasticsearch/reference/master/collapse-search-results.html
+  - target: "$.components['schemas']['_global.msearch:MultisearchBody'].properties"
+    description: Add x-model
+    update:
+      aggregations:
+        x-model: true
 # Examples
   - target: "$.components['requestBodies']['async_search.submit']"
     description: "Add example for asynch search submit request"
diff --git a/output/schema/schema.json b/output/schema/schema.json
index 66ee64b4f5..8594ee1680 100644
--- a/output/schema/schema.json
+++ b/output/schema/schema.json
@@ -27507,7 +27507,7 @@
           }
         }
       ],
-      "specLocation": "_global/msearch/types.ts#L213-L216"
+      "specLocation": "_global/msearch/types.ts#L216-L219"
     },
     {
       "kind": "interface",
@@ -27557,7 +27557,7 @@
           }
         }
       ],
-      "specLocation": "_global/msearch/types.ts#L203-L206"
+      "specLocation": "_global/msearch/types.ts#L206-L209"
     },
     {
       "kind": "interface",
@@ -27570,6 +27570,7 @@
           "aliases": [
             "aggs"
           ],
+          "extDocId": "search-aggregations",
           "name": "aggregations",
           "required": false,
           "type": {
@@ -28029,7 +28030,7 @@
           }
         }
       ],
-      "specLocation": "_global/msearch/types.ts#L70-L201"
+      "specLocation": "_global/msearch/types.ts#L70-L204"
     },
     {
       "kind": "interface",
@@ -28455,7 +28456,7 @@
         "name": "ResponseItem",
         "namespace": "_global.msearch"
       },
-      "specLocation": "_global/msearch/types.ts#L208-L211",
+      "specLocation": "_global/msearch/types.ts#L211-L214",
       "type": {
         "kind": "union_of",
         "items": [
@@ -35092,6 +35093,8 @@
     },
     {
       "kind": "interface",
+      "extDocId": "collapse-search-results",
+      "extDocUrl": "https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/collapse-search-results.html",
       "name": {
         "name": "FieldCollapse",
         "namespace": "_global.search._types"
@@ -35160,7 +35163,7 @@
           }
         }
       ],
-      "specLocation": "_global/search/_types/FieldCollapse.ts#L24-L38"
+      "specLocation": "_global/search/_types/FieldCollapse.ts#L24-L41"
     },
     {
       "kind": "interface",
diff --git a/specification/_doc_ids/table.csv b/specification/_doc_ids/table.csv
index ca10e4db29..3c4df835c7 100644
--- a/specification/_doc_ids/table.csv
+++ b/specification/_doc_ids/table.csv
@@ -80,6 +80,7 @@ cluster,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/cluster
 common-options,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/common-options.html
 community-id-processor,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/community-id-processor.html
 connector-sync-job-cancel,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/cancel-connector-sync-job-api.html
+collapse-search-results,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/collapse-search-results.html
 connector-sync-job-delete,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/delete-connector-sync-job-api.html
 connector-sync-job-get,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/get-connector-sync-job-api.html
 connector-sync-job-post,https://www.elastic.co/guide/en/elasticsearch/reference/{branch}/create-connector-sync-job-api.html
diff --git a/specification/_global/msearch/types.ts b/specification/_global/msearch/types.ts
index bfc20059ac..ec6efbf38b 100644
--- a/specification/_global/msearch/types.ts
+++ b/specification/_global/msearch/types.ts
@@ -68,7 +68,10 @@ export class MultisearchHeader {
 
 // We should keep this in sync with the normal search request body.
 export class MultisearchBody {
-  /** @aliases aggs */ // ES uses "aggregations" in serialization
+  /**
+   * @aliases aggs
+   * @ext_doc_id search-aggregations
+   */ // ES uses "aggregations" in serialization
   aggregations?: Dictionary<string, AggregationContainer>
   collapse?: FieldCollapse
   /**
diff --git a/specification/_global/search/_types/FieldCollapse.ts b/specification/_global/search/_types/FieldCollapse.ts
index bc867ad4d8..2afdd7baee 100644
--- a/specification/_global/search/_types/FieldCollapse.ts
+++ b/specification/_global/search/_types/FieldCollapse.ts
@@ -21,6 +21,9 @@ import { Field } from '@_types/common'
 import { integer } from '@_types/Numeric'
 import { InnerHits } from './hits'
 
+/**
+ * @ext_doc_id collapse-search-results
+ */
 export class FieldCollapse {
   /**
    * The field to collapse the result set on