diff --git a/solrorbit/worker_coordinator/runner.py b/solrorbit/worker_coordinator/runner.py
index 73d65605..74162a16 100644
--- a/solrorbit/worker_coordinator/runner.py
+++ b/solrorbit/worker_coordinator/runner.py
@@ -1151,18 +1151,18 @@ async def __call__(self, client, params):
         for doc in doc_stream:
             batch.append(doc)
             if len(batch) >= batch_size:
+                total_docs += len(batch)
                 try:
                     await _run_in_executor(sc.add, collection, batch, commit=False, commitWithin=1000)
-                    total_docs += len(batch)
                 except pysolr.SolrError as exc:
                     logging.getLogger(__name__).error("Bulk index error on batch: %s", exc)
                     errors += len(batch)
                 batch = []
 
         if batch:
+            total_docs += len(batch)
             try:
                 await _run_in_executor(sc.add, collection, batch, commit=False, commitWithin=1000)
-                total_docs += len(batch)
             except pysolr.SolrError as exc:
                 logging.getLogger(__name__).error("Bulk index error on final batch: %s", exc)
                 errors += len(batch)
@@ -1171,6 +1171,7 @@ async def __call__(self, client, params):
             await _run_in_executor(sc.commit, collection)
 
         elapsed = time.perf_counter() - start
+        # total_docs counts every document sent, so this is the number actually indexed.
         weight = total_docs - errors
 
         return {
diff --git a/tests/unit/solr/test_runner.py b/tests/unit/solr/test_runner.py
index 352ab808..e9341509 100644
--- a/tests/unit/solr/test_runner.py
+++ b/tests/unit/solr/test_runner.py
@@ -202,6 +202,41 @@ def test_bulk_index_reports_errors(self):
         self.assertFalse(result["success"])
         self.assertGreater(result["error-count"], 0)
 
+    def test_partial_failure_counts_failed_docs_once(self):
+        """A failed batch is reported as errors, not also subtracted from the indexed docs."""
+        import pysolr
+        mock_sc = MagicMock()
+        mock_sc.add.side_effect = [None, pysolr.SolrError("Indexing error")]
+
+        lines = [
+            '{"index": {"_id": "1"}}',
+            '{"title": "doc"}',
+            '{"index": {"_id": "2"}}',
+            '{"title": "doc"}',
+        ]
+        params = {**self._params(lines), "bulk-size": 1}
+        result = _run(SolrBulkIndex()(mock_sc, params))
+
+        self.assertEqual(1, result["weight"])
+        self.assertEqual(2, result["bulk-size"])
+        self.assertEqual(1, result["error-count"])
+        self.assertFalse(result["success"])
+
+    def test_failed_bulk_has_zero_weight(self):
+        import pysolr
+        mock_sc = MagicMock()
+        mock_sc.add.side_effect = pysolr.SolrError("Indexing error")
+
+        lines = [
+            '{"index": {"_id": "1"}}',
+            '{"title": "doc"}',
+        ]
+        result = _run(SolrBulkIndex()(mock_sc, self._params(lines)))
+
+        self.assertEqual(0, result["weight"])
+        self.assertEqual(1, result["bulk-size"])
+        self.assertEqual(1, result["error-count"])
+
     def test_simple_ndjson_format(self):
         """Test simple NDJSON (one doc per line, no action lines)."""
         mock_sc = MagicMock()