[NDM] [Cisco ACI] Use actual int for interface index (#18414)

* Use actual int for interface index

* Changelog

* Update cisco_aci/datadog_checks/cisco_aci/models.py

Co-authored-by: dkirov-dd <166512750+dkirov-dd@users.noreply.github.com>

---------

Co-authored-by: Jim Wilson <86026167+jmw51798@users.noreply.github.com>
Co-authored-by: dkirov-dd <166512750+dkirov-dd@users.noreply.github.com>
(cherry picked from commit 6915c80)

cisco_aci/changelog.d/18414.fixed

@@ -0,0 +1 @@
+[NDM] [Cisco ACI] Use actual int for interface index

cisco_aci/datadog_checks/cisco_aci/models.py

@@ -2,6 +2,8 @@
 # All rights reserved
 # Licensed under a 3-clause BSD style license (see LICENSE)
 
+import re
+
 import six
 
 if six.PY3:
@@ -123,7 +125,7 @@ class Status(StrEnum):
     class InterfaceMetadata(BaseModel):
         device_id: Optional[str] = Field(default=None)
         id_tags: list = Field(default_factory=list)
-        index: Optional[str] = Field(default=None)
+        index: Optional[int] = Field(default=None)
         name: Optional[str] = Field(default=None)
         description: Optional[str] = Field(default=None)
         mac_address: Optional[str] = Field(default=None)
@@ -151,6 +153,16 @@ def parse_oper_status(cls, oper_status: OperStatus | None) -> OperStatus | None:
                 return OperStatus.UP
             return OperStatus.DOWN
 
+        @field_validator("index", mode="before")
+        @classmethod
+        def parse_index(cls, index: str | int | None) -> int | None:
+            if type(index) == str:
+                split = re.split('eth|/', index)
+                return int(split[-1])
+            if type(index) == int:
+                return index
+            return None
+
         @computed_field
         @property
         def status(self) -> Status: