diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index d6133332..3d1b9cf7 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -72,10 +72,10 @@ quarkus.hibernate-search-standalone.elasticsearch.version=opensearch:2.18
 quarkus.elasticsearch.devservices.image-name=opensearch-custom:${maven.version.opensearch}
 quarkus.elasticsearch.devservices.java-opts=${PROD_OPENSEARCH_JAVA_OPTS}
 # Limit parallelism of indexing, because OpenSearch can only handle so many documents in its buffers.
-# This leads to at most 8*20=160 documents being indexed in parallel, which should be plenty
+# This leads to at most 8*12=96 documents being indexed in parallel, which should be plenty
 # given how large our documents can be.
 INDEXING_QUEUE_COUNT=8
-INDEXING_BULK_SIZE=20
+INDEXING_BULK_SIZE=12
 quarkus.hibernate-search-standalone.elasticsearch.indexing.queue-count=${INDEXING_QUEUE_COUNT}
 quarkus.hibernate-search-standalone.elasticsearch.indexing.max-bulk-size=${INDEXING_BULK_SIZE}
 # We need to apply a custom OpenSearch mapping to exclude very large fields from the _source