Merge pull request #122 from yrodiere/connection-pool-size

Adjust indexing parallelism (DB connection pool size, indexing queue count)

src/main/resources/application.properties

@@ -42,14 +42,18 @@ quarkus.resteasy-reactive.path=/api
 ## after some inactivity; see https://github.com/quarkusio/search.quarkus.io/issues/100
 quarkus.datasource.jdbc.url=jdbc:h2:mem:searchquarkusio;DB_CLOSE_DELAY=-1
 quarkus.hibernate-orm.database.generation=drop-and-create
+## We need a large enough connection pool to accommodate highly-parallel indexing.
+quarkus.datasource.jdbc.max-size=100
+## But we don't need it to be that large after indexing.
+quarkus.datasource.jdbc.min-size=0
 ## Hibernate Search
 quarkus.hibernate-search-orm.elasticsearch.version=opensearch:2.11
 quarkus.elasticsearch.devservices.image-name=opensearch-custom-plugin:2.11.0
-## Limit parallelism of indexing, because OpenSearch can only handle so many pending indexing requests.
-## This leads to at most 6*40=240 documents being indexed in parallel, which should be plenty
+## Limit parallelism of indexing, because OpenSearch can only handle so many documents in its buffers.
+## This leads to at most 12*20=240 documents being indexed in parallel, which should be plenty
 ## given how large our documents can be.
-quarkus.hibernate-search-orm.elasticsearch.indexing.queue-count=6
-quarkus.hibernate-search-orm.elasticsearch.indexing.max-bulk-size=40
+quarkus.hibernate-search-orm.elasticsearch.indexing.queue-count=12
+quarkus.hibernate-search-orm.elasticsearch.indexing.max-bulk-size=20
 ## We need to apply a custom OpenSearch mapping to exclude very large fields from the _source
 quarkus.hibernate-search-orm.elasticsearch.schema-management.mapping-file=indexes/mapping-template.json
 quarkus.hibernate-search-orm.elasticsearch.schema-management.settings-file=indexes/settings-template.json