diff --git a/cl/lib/test_helpers.py b/cl/lib/test_helpers.py
index 04068a4601..13e6887c37 100644
--- a/cl/lib/test_helpers.py
+++ b/cl/lib/test_helpers.py
@@ -190,6 +190,7 @@ def midnight_pt_test(d: datetime.date) -> datetime.datetime:
     "snippet": lambda x: (
         x["snippet"] if x.get("snippet") else x["result"].plain_text or ""
     ),
+    "ordering_key": lambda x: x["result"].ordering_key,
 }
 
 opinion_cluster_v3_fields = opinion_cluster_v3_v4_common_fields.copy()
diff --git a/cl/search/api_serializers.py b/cl/search/api_serializers.py
index 6728e60617..1a49535080 100644
--- a/cl/search/api_serializers.py
+++ b/cl/search/api_serializers.py
@@ -564,6 +564,7 @@ class Meta:
             "local_path",
             "sha1",
             "cites",
+            "ordering_key",
         )
 
 
diff --git a/cl/search/documents.py b/cl/search/documents.py
index fcae4baaf6..8fb50bc5af 100644
--- a/cl/search/documents.py
+++ b/cl/search/documents.py
@@ -1633,6 +1633,7 @@ class OpinionDocument(OpinionBaseDocument):
     joined_by_ids = fields.ListField(
         fields.IntegerField(multi=True),
     )
+    ordering_key = fields.IntegerField(attr="ordering_key")
 
     class Django:
         model = Opinion
diff --git a/cl/search/management/commands/cl_index_parent_and_child_docs.py b/cl/search/management/commands/cl_index_parent_and_child_docs.py
index 366d9fe13e..42121456e6 100644
--- a/cl/search/management/commands/cl_index_parent_and_child_docs.py
+++ b/cl/search/management/commands/cl_index_parent_and_child_docs.py
@@ -342,6 +342,13 @@ def add_arguments(self, parser):
             action="store_true",
             help="Use this flag to only index documents missing in the index.",
         )
+        parser.add_argument(
+            "--non-null-field",
+            type=str,
+            required=False,
+            choices=["ordering_key"],
+            help="Include only documents where this field is not Null.",
+        )
 
     def handle(self, *args, **options):
         super().handle(*args, **options)
@@ -363,6 +370,7 @@ def handle(self, *args, **options):
             )
         start_date: date | None = options.get("start_date", None)
         end_date: date | None = options.get("end_date", None)
+        non_null_field: str | None = options.get("non_null_field", None)
 
         es_document = None
         match search_type:
@@ -414,8 +422,13 @@ def handle(self, *args, **options):
 
             case SEARCH_TYPES.OPINION:
                 if document_type == "child":
+                    filters = {"pk__gte": pk_offset}
+                    # If non_null_field is not None use it as a filter
+                    if non_null_field:
+                        filters[f"{non_null_field}__isnull"] = False
+
                     queryset = (
-                        Opinion.objects.filter(pk__gte=pk_offset)
+                        Opinion.objects.filter(**filters)
                         .order_by("pk")
                         .values_list("pk", "cluster_id")
                     )
diff --git a/cl/search/models.py b/cl/search/models.py
index 92ae30c2f4..ec6f819ded 100644
--- a/cl/search/models.py
+++ b/cl/search/models.py
@@ -3215,6 +3215,7 @@ class Opinion(AbstractDateTimeModel):
             "html",
             "plain_text",
             "sha1",
+            "ordering_key",
         ]
     )
     ordering_key = models.IntegerField(null=True, blank=True)
diff --git a/cl/search/signals.py b/cl/search/signals.py
index abfe8d448c..bf19cb1678 100644
--- a/cl/search/signals.py
+++ b/cl/search/signals.py
@@ -425,6 +425,7 @@
                 "html": ["text"],
                 "plain_text": ["text"],
                 "sha1": ["sha1"],
+                "ordering_key": ["ordering_key"],
             },
         },
     },
diff --git a/cl/search/tests/tests_es_opinion.py b/cl/search/tests/tests_es_opinion.py
index 7014aaa8c8..82f6734e57 100644
--- a/cl/search/tests/tests_es_opinion.py
+++ b/cl/search/tests/tests_es_opinion.py
@@ -3111,6 +3111,45 @@ def test_opinions_indexing_missing_flag(self):
             s.count(), 6, msg="Wrong number of Opinions returned."
         )
 
+    def test_opinions_indexing_non_null_field(self):
+        """Confirm that the indexing command properly filters out instances to
+        be indexed based on the non-null field value provided as a parameter.
+        """
+
+        s = OpinionClusterDocument.search().query("match_all")
+        self.assertEqual(s.count(), 0)
+
+        opinion = OpinionFactory.create(
+            extracted_by_ocr=False,
+            author=self.person_2,
+            plain_text="my plain text secret word for queries",
+            cluster=self.opinion_cluster_1,
+            local_path="test/search/opinion_doc.doc",
+            per_curiam=False,
+            type="020lead",
+            ordering_key=5,
+        )
+
+        # Call cl_index_parent_and_child_docs command for Opinion.
+        call_command(
+            "cl_index_parent_and_child_docs",
+            search_type=SEARCH_TYPES.OPINION,
+            queue="celery",
+            pk_offset=0,
+            document_type="child",
+            testing_mode=True,
+            non_null_field="ordering_key",
+        )
+
+        # Confirm 1 Opinions is indexed.
+        s = OpinionClusterDocument.search()
+        s = s.query("parent_id", type="opinion", id=self.opinion_cluster_1.pk)
+        self.assertEqual(
+            s.count(), 1, msg="Wrong number of Opinions returned."
+        )
+        es_doc = OpinionDocument.get(ES_CHILD_ID(opinion.pk).OPINION)
+        self.assertEqual(es_doc.ordering_key, opinion.ordering_key)
+
 
 class EsOpinionsIndexingTest(
     CountESTasksTestCase, ESIndexTestCase, TransactionTestCase
@@ -3285,12 +3324,17 @@ def test_child_document_update_properly(self) -> None:
                 local_path="test/search/opinion_doc.doc",
                 per_curiam=False,
                 type="020lead",
+                ordering_key=1,
             )
 
         # Two es_save_document task should be called on creation, one for
         # opinion and one for opinion_cluster
         self.reset_and_assert_task_count(expected=2)
 
+        # Confirm the new ordering_key field is indexed upon Opinion creation.
+        es_doc = OpinionDocument.get(ES_CHILD_ID(opinion.pk).OPINION)
+        self.assertEqual(es_doc.ordering_key, opinion.ordering_key)
+
         with mock.patch(
             "cl.lib.es_signal_processor.update_es_document.si",
             side_effect=lambda *args, **kwargs: self.count_task_calls(
@@ -3303,6 +3347,22 @@ def test_child_document_update_properly(self) -> None:
         # One update_es_document task should be called on tracked field update.
         self.reset_and_assert_task_count(expected=1)
 
+        with mock.patch(
+            "cl.lib.es_signal_processor.update_es_document.si",
+            side_effect=lambda *args, **kwargs: self.count_task_calls(
+                update_es_document, True, *args, **kwargs
+            ),
+        ):
+            # Update the ordering_key field in the opinion record.
+            opinion.ordering_key = None
+            opinion.save()
+
+        # One update_es_document task should be called on tracked field update.
+        self.reset_and_assert_task_count(expected=1)
+        # Confirm the ordering_key has been updated.
+        es_doc = OpinionDocument.get(ES_CHILD_ID(opinion.pk).OPINION)
+        self.assertEqual(es_doc.ordering_key, None)
+
         # Update an opinion untracked field.
         with mock.patch(
             "cl.lib.es_signal_processor.update_es_document.si",