fix: revert ES_VERSION to v7 for v1.28.x compatibility (#317)

The v1.28.x auto-setup image only contains v7 ES schema files
(cluster_settings_v7.json, index_template_v7.json). Setting ES_VERSION=v8
causes auto-setup to look for cluster_settings_v8.json which doesn't exist.

ES 8.5.0 is backwards-compatible with v7 API calls, so using ES_VERSION=v7
with ELASTICSEARCH_VERSION=8.5.0 is the correct configuration for v1.28.x.

Made-with: Cursor

Author: rkannan82

docker-compose.yml

@@ -42,7 +42,7 @@ services:
       - POSTGRES_SEEDS=postgresql
       - ENABLE_ES=true
       - ES_SEEDS=elasticsearch
-      - ES_VERSION=v8
+      - ES_VERSION=v7
     image: ${IMAGE_REPO}/auto-setup:${IMAGE_TAG}
     networks:
       - temporal-network