feat: deprecate issue_matches

docs: if conversation medium is unspecified, it will default to PHONE_CALL

PiperOrigin-RevId: 400004079

google/cloud/contactcenterinsights/v1/contact_center_insights.proto

@@ -376,7 +376,8 @@ message CalculateStatsResponse {
   // matches in the set of conversations. Key has the format:
   // `projects/<Project ID>/locations/<Location ID>/issueModels/<Issue Model
   // ID>/issues/<Issue ID>`
-  map<string, int32> issue_matches = 6;
+  // Deprecated, use `issue_matches_stats` field instead.
+  map<string, int32> issue_matches = 6 [deprecated = true];
 
   // A time series representing the count of conversations created over time
   // that match that requested filter criteria.

google/cloud/contactcenterinsights/v1/resources.proto

@@ -120,7 +120,7 @@ message Conversation {
 
   // Possible media for the conversation.
   enum Medium {
-    // Default value.
+    // Default value, if unspecified will default to PHONE_CALL.
     MEDIUM_UNSPECIFIED = 0;
 
     // The format for conversations that took place over the phone.
@@ -181,7 +181,7 @@ message Conversation {
   // Output only. The conversation transcript.
   Transcript transcript = 8 [(google.api.field_behavior) = OUTPUT_ONLY];
 
-  // Immutable. The conversation medium.
+  // Immutable. The conversation medium, if unspecified will default to PHONE_CALL.
   Medium medium = 9 [(google.api.field_behavior) = IMMUTABLE];
 
   // Output only. The duration of the conversation.