diff --git a/.apigentools-info b/.apigentools-info
index 5b5bedee31..1e640c866d 100644
--- a/.apigentools-info
+++ b/.apigentools-info
@@ -4,13 +4,13 @@
     "spec_versions": {
         "v1": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-06-13 13:39:11.219540",
-            "spec_repo_commit": "9757e1ea"
+            "regenerated": "2025-06-13 20:50:47.970284",
+            "spec_repo_commit": "7fe71d9f"
         },
         "v2": {
             "apigentools_version": "1.6.6",
-            "regenerated": "2025-06-13 13:39:11.262516",
-            "spec_repo_commit": "9757e1ea"
+            "regenerated": "2025-06-13 20:50:47.985129",
+            "spec_repo_commit": "7fe71d9f"
         }
     }
 }
\ No newline at end of file
diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index 3bb674967f..01f88539a3 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -19273,12 +19273,6 @@ components:
     JobDefinitionFromRule:
       description: Definition of a historical job based on a security monitoring rule.
       properties:
-        caseIndex:
-          description: Index of the rule case applied by the job.
-          example: 0
-          format: int32
-          maximum: 9
-          type: integer
         from:
           description: Starting time of data analyzed by the job.
           example: 1729843470000
@@ -19309,7 +19303,6 @@ components:
       - from
       - to
       - index
-      - caseIndex
       type: object
     KindAttributes:
       description: Kind attributes.
diff --git a/src/datadog_api_client/v2/model/job_definition_from_rule.py b/src/datadog_api_client/v2/model/job_definition_from_rule.py
index 3379279a2b..fc6c3c033f 100644
--- a/src/datadog_api_client/v2/model/job_definition_from_rule.py
+++ b/src/datadog_api_client/v2/model/job_definition_from_rule.py
@@ -14,16 +14,9 @@
 
 
 class JobDefinitionFromRule(ModelNormal):
-    validations = {
-        "case_index": {
-            "inclusive_maximum": 9,
-        },
-    }
-
     @cached_property
     def openapi_types(_):
         return {
-            "case_index": (int,),
             "_from": (int,),
             "id": (str,),
             "index": (str,),
@@ -32,7 +25,6 @@ def openapi_types(_):
         }
 
     attribute_map = {
-        "case_index": "caseIndex",
         "_from": "from",
         "id": "id",
         "index": "index",
@@ -41,21 +33,11 @@ def openapi_types(_):
     }
 
     def __init__(
-        self_,
-        case_index: int,
-        _from: int,
-        id: str,
-        index: str,
-        to: int,
-        notifications: Union[List[str], UnsetType] = unset,
-        **kwargs,
+        self_, _from: int, id: str, index: str, to: int, notifications: Union[List[str], UnsetType] = unset, **kwargs
     ):
         """
         Definition of a historical job based on a security monitoring rule.
 
-        :param case_index: Index of the rule case applied by the job.
-        :type case_index: int
-
         :param _from: Starting time of data analyzed by the job.
         :type _from: int
 
@@ -75,7 +57,6 @@ def __init__(
             kwargs["notifications"] = notifications
         super().__init__(kwargs)
 
-        self_.case_index = case_index
         self_._from = _from
         self_.id = id
         self_.index = index
diff --git a/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.frozen b/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.frozen
index ee3fdb952b..e905022425 100644
--- a/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.frozen
+++ b/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.frozen
@@ -1 +1 @@
-2024-11-08T09:54:40.192Z
\ No newline at end of file
+2025-06-12T14:01:05.945Z
\ No newline at end of file
diff --git a/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.yaml b/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.yaml
index f56640a5cc..7413b27ce3 100644
--- a/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.yaml
+++ b/tests/v2/cassettes/test_scenarios/test_run_a_historical_job_returns_not_found_response.yaml
@@ -1,6 +1,6 @@
 interactions:
 - request:
-    body: '{"data":{"attributes":{"fromRule":{"caseIndex":0,"from":1730201035064,"id":"non-existng","index":"main","notifications":[],"to":1730204635115}},"type":"historicalDetectionsJobCreate"}}'
+    body: '{"data":{"attributes":{"fromRule":{"from":1730201035064,"id":"non-existng","index":"main","notifications":[],"to":1730204635115}},"type":"historicalDetectionsJobCreate"}}'
     headers:
       accept:
       - application/json
@@ -10,7 +10,7 @@ interactions:
     uri: https://api.datadoghq.com/api/v2/siem-historical-detections/jobs
   response:
     body:
-      string: '{"errors":[{"status":"404","detail":"failed to get rule details"}]}'
+      string: '{"errors":[{"status":"404","title":"Not Found"}]}'
     headers:
       content-type:
       - application/vnd.api+json
diff --git a/tests/v2/features/security_monitoring.feature b/tests/v2/features/security_monitoring.feature
index 9f2039d79e..33a5978075 100644
--- a/tests/v2/features/security_monitoring.feature
+++ b/tests/v2/features/security_monitoring.feature
@@ -1095,7 +1095,7 @@ Feature: Security Monitoring
   Scenario: Run a historical job returns "Not Found" response
     Given operation "RunHistoricalJob" enabled
     And new "RunHistoricalJob" request
-    And body with value {"data": { "type": "historicalDetectionsJobCreate", "attributes": {"fromRule": {"caseIndex": 0, "from": 1730201035064, "id": "non-existng", "index": "main", "notifications": [], "to": 1730204635115}}}}
+    And body with value {"data": { "type": "historicalDetectionsJobCreate", "attributes": {"fromRule": {"from": 1730201035064, "id": "non-existng", "index": "main", "notifications": [], "to": 1730204635115}}}}
     When the request is sent
     Then the response status is 404 Not Found