Increase OpenSearch PVC size from 8Gi to 100Gi

Signed-off-by: Kyle Hounslow <kylhouns@amazon.com>

Author: kylehounslow

charts/observability-stack/values.yaml

@@ -24,7 +24,7 @@ opensearch:
       cpu: "4000m"
   persistence:
     enabled: true
-    size: 8Gi                    # Increase for production (e.g. 100Gi, 500Gi)
+    size: 100Gi
     # storageClass: "gp3"       # Uncomment for AWS gp3 (better IOPS/$ than gp2)
   # JVM heap — set to 50% of resources.requests.memory, max 31g
   opensearchJavaOpts: "-Xms2g -Xmx2g"