community[patch]: Add ID field back to Azure AI Search results (#25828)

Commandeering #23243 as
maintainers don't have ability to modify that PR.

Fixes #22827

---------

Co-authored-by: Ming Quah <fleetadmiralbutter@icloud.com>

libs/community/langchain_community/vectorstores/azuresearch.py

@@ -1283,6 +1283,11 @@ def semantic_hybrid_search_with_score_and_rerank(
                 Document(
                     page_content=result.pop(FIELDS_CONTENT),
                     metadata={
+                        **(
+                            {FIELDS_ID: result.pop(FIELDS_ID)}
+                            if FIELDS_ID in result
+                            else {}
+                        ),
                         **(
                             json.loads(result[FIELDS_METADATA])
                             if FIELDS_METADATA in result
@@ -1362,6 +1367,11 @@ async def asemantic_hybrid_search_with_score_and_rerank(
                 Document(
                     page_content=result.pop(FIELDS_CONTENT),
                     metadata={
+                        **(
+                            {FIELDS_ID: result.pop(FIELDS_ID)}
+                            if FIELDS_ID in result
+                            else {}
+                        ),
                         **(
                             json.loads(result[FIELDS_METADATA])
                             if FIELDS_METADATA in result
@@ -1752,16 +1762,26 @@ def _reorder_results_with_maximal_marginal_relevance(
 
 
 def _result_to_document(result: Dict) -> Document:
+    # Fields metadata
+    if FIELDS_METADATA in result:
+        if isinstance(result[FIELDS_METADATA], dict):
+            fields_metadata = result[FIELDS_METADATA]
+        else:
+            fields_metadata = json.loads(result[FIELDS_METADATA])
+    else:
+        fields_metadata = {
+            key: value for key, value in result.items() if key != FIELDS_CONTENT_VECTOR
+        }
+    # IDs
+    if FIELDS_ID in result:
+        fields_id = {FIELDS_ID: result.pop(FIELDS_ID)}
+    else:
+        fields_id = {}
     return Document(
         page_content=result.pop(FIELDS_CONTENT),
-        metadata=(
-            result[FIELDS_METADATA]
-            if isinstance(result[FIELDS_METADATA], dict)
-            else json.loads(result[FIELDS_METADATA])
-        )
-        if FIELDS_METADATA in result
-        else {
-            key: value for key, value in result.items() if key != FIELDS_CONTENT_VECTOR
+        metadata={
+            **fields_id,
+            **fields_metadata,
         },
     )