fix(stats): lower aggregation bucket size

Author: slint

invenio.cfg

@@ -470,6 +470,9 @@ from zenodo_rdm.stats.proxies import current_stats_search_client
 
 for _agg in STATS_AGGREGATIONS.values():
     _agg.setdefault("params", {})["client"] = current_stats_search_client
+    # NOTE: Originally was 10_000, but when under heavy load, this can cause timeouts
+    # and aggregations processing getting stuck.
+    _agg.setdefault("params", {})["max_bucket_size"] = 5_000
 
 INDEXER_MQ_PUBLISH_KWARGS = {
     "retry": True,