Revert "Reduce resource usage even more on staging"

This reverts commit 40deeae.

Resources are _too_ constrainted now, and we're tripping timeouts.
I guess we could raise timeouts, but since it's been confirmed we were
not using too much resources, let's make this run faster.

src/main/helm/values.staging.yaml

@@ -3,21 +3,21 @@ app:
     QUARKUS_PROFILE: 'staging'
     # Avoid overloading the rather resource-constrained Search backend instance
     INDEXING_QUEUE_COUNT: '4'
-    INDEXING_BULK_SIZE: '5'
+    INDEXING_BULK_SIZE: '10'
   resources:
     limits:
       cpu: 1000m
-      memory: 750Mi
+      memory: 1Gi
     requests:
       cpu: 250m
-      memory: 400Mi
+      memory: 500Mi
 elasticsearch:
   envs:
-    ES_JAVA_OPTS: ' -Xms350m -Xmx350m '
+    ES_JAVA_OPTS: ' -Xms500m -Xmx500m '
   resources:
     limits:
       cpu: 500m
       memory: 1.0Gi
     requests:
       cpu: 250m
-      memory: 500Mi
+      memory: 750Mi