rename source to ddsource (#6296)

Author: PSeitz

quickwit/quickwit-cli/src/logger.rs

@@ -359,7 +359,7 @@ where
 ///
 /// Example output:
 /// ```json
-/// {"timestamp":"2025-03-23T14:30:45Z","level":"INFO","service":"byoc","source":"byoc","message":"INFO quickwit_search: hello"}
+/// {"timestamp":"2025-03-23T14:30:45Z","level":"INFO","service":"byoc","ddsource":"byoc","message":"INFO quickwit_search: hello"}
 /// ```
 struct DdgFormat {
     text_format: Format<Full, ()>,
@@ -403,7 +403,7 @@ where
         let escaped_message = serde_json::to_string(message).map_err(|_| fmt::Error)?;
         writeln!(
             writer,
-            r#"{{"timestamp":"{timestamp}","level":"{level}","service":"byoc","source":"byoc","message":{escaped_message}}}"#
+            r#"{{"timestamp":"{timestamp}","level":"{level}","service":"byoc","ddsource":"byoc","message":{escaped_message}}}"#
         )
     }
 }
@@ -629,7 +629,7 @@ mod tests {
         assert!(obj.contains_key("timestamp"));
         assert!(obj.contains_key("level"));
         assert!(obj.contains_key("service"));
-        assert!(obj.contains_key("source"));
+        assert!(obj.contains_key("ddsource"));
         assert!(obj.contains_key("message"));
     }
 
@@ -638,7 +638,7 @@ mod tests {
         let json = capture_ddg_log(|| tracing::info!("hello world"));
         assert_eq!(json["level"], "INFO");
         assert_eq!(json["service"], "byoc");
-        assert_eq!(json["source"], "byoc");
+        assert_eq!(json["ddsource"], "byoc");
         assert_eq!(
             json["message"].as_str().unwrap(),
             format!("INFO {TARGET}: hello world")