fix bug, shouldn't have been an issue but it is for some reason

lib/pleroma/web/api_spec/operations/chat_operation.ex

@@ -1,5 +1,5 @@
 # Pleroma: A lightweight social networking server
-# Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
+# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
 # SPDX-License-Identifier: AGPL-3.0-only
 
 defmodule Pleroma.Web.ApiSpec.ChatOperation do
@@ -128,6 +128,28 @@ defmodule Pleroma.Web.ApiSpec.ChatOperation do
     }
   end
 
+  def index_operation do
+    %Operation{
+      tags: ["Chats"],
+      summary: "Retrieve list of chats (unpaginated)",
+      deprecated: true,
+      description:
+        "Deprecated due to no support for pagination. Using [/api/v2/pleroma/chats](#operation/ChatController.index2) instead is recommended.",
+      operationId: "ChatController.index",
+      parameters: [
+        Operation.parameter(:with_muted, :query, BooleanLike, "Include chats from muted users")
+      ],
+      responses: %{
+        200 => Operation.response("The chats of the user", "application/json", chats_response())
+      },
+      security: [
+        %{
+          "oAuth" => ["read:chats"]
+        }
+      ]
+    }
+  end
+
   def index2_operation do
     %Operation{
       tags: ["Chats"],