From 3c09b7bd913f7e4dafce23e64a31eae7d566dbcf Mon Sep 17 00:00:00 2001
From: Ben Millar <44114751+ben-millar@users.noreply.github.com>
Date: Wed, 22 Nov 2023 14:42:54 +0000
Subject: [PATCH] CORE-18495 Made topic field in ExternalEvent.avsc optional;
 defaults to null (#1357)

Now that some external events are send over HTTP RPC rather than the Kafka message bus, we're making the `topic` field in the ExternalEvent AVRO object optional so it need not be set for HTTP-based communications.
---
 .../net/corda/data/flow/event/external/ExternalEvent.avsc    | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/data/avro-schema/src/main/resources/avro/net/corda/data/flow/event/external/ExternalEvent.avsc b/data/avro-schema/src/main/resources/avro/net/corda/data/flow/event/external/ExternalEvent.avsc
index 740370142a..bb40e19cfd 100644
--- a/data/avro-schema/src/main/resources/avro/net/corda/data/flow/event/external/ExternalEvent.avsc
+++ b/data/avro-schema/src/main/resources/avro/net/corda/data/flow/event/external/ExternalEvent.avsc
@@ -6,8 +6,9 @@
   "fields": [
     {
       "name": "topic",
-      "type": "string",
-      "doc": "The topic that the external event is sent to."
+      "type": ["null", "string"],
+      "doc": "The topic that the external event is sent to.",
+      "default": null
     },
     {
       "name": "key",