diff --git a/quickwit/quickwit-indexing/src/actors/doc_processor.rs b/quickwit/quickwit-indexing/src/actors/doc_processor.rs
index d8c86faca8c..cf1aca7752e 100644
--- a/quickwit/quickwit-indexing/src/actors/doc_processor.rs
+++ b/quickwit/quickwit-indexing/src/actors/doc_processor.rs
@@ -21,6 +21,7 @@ use std::string::FromUtf8Error;
 use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::Arc;
 
+use thiserror::Error;
 use anyhow::{bail, Context};
 use async_trait::async_trait;
 use bytes::Bytes;
@@ -79,12 +80,16 @@ impl JsonDoc {
     }
 }
 
-#[derive(Debug)]
+#[derive(Error, Debug)]
 pub enum DocProcessorError {
+    #[error("doc mapper parsing error: {0}")]
     DocMapperParsing(DocParsingError),
+    #[error("OLTP trace parsing error: {0}")]
     OltpTraceParsing(OtlpTraceError),
+    #[error("doc parsing error: {0}")]
     Parsing(String),
     #[cfg(feature = "vrl")]
+    #[error("VRL transform error: {0}")]
     Transform(VrlTerminate),
 }
 
@@ -309,7 +314,7 @@ impl DocProcessorCounters {
             }
             DocProcessorError::Parsing(_) => {
                 self.num_doc_parsing_errors.fetch_add(1, Ordering::Relaxed);
-                "json_parsing_error"
+                "parsing_error"
             }
             #[cfg(feature = "vrl")]
             DocProcessorError::Transform(_) => {
@@ -408,7 +413,7 @@ impl DocProcessor {
                     processed_docs.push(processed_doc);
                 }
                 Err(error) => {
-                    warn!(index_id=self.counters.index_id, source_id=self.counters.source_id, error=?error);
+                    warn!(index_id=self.counters.index_id, source_id=self.counters.source_id, "{}", error);
                     self.counters.record_error(error, num_bytes as u64);
                 }
             }