update docker compose: elasticsearch is now optional (#61)

Author: ciur

docker/docker-compose.yml

@@ -5,6 +5,7 @@ x-backend: &backend  # yaml anchor definition
   image: ${APP_IMAGE}:${APP_TAG}
   volumes:
     - media_root:/app/media
+    - xapian_index:/app/xapian_index
   environment:
     # PAPERMERGE__<section>__<variable>
     - PAPERMERGE__MAIN__SECRET_KEY=${SECRET_KEY}
@@ -15,9 +16,9 @@ x-backend: &backend  # yaml anchor definition
     - PAPERMERGE__DATABASE__HOST=${DB_HOST}
     - PAPERMERGE__REDIS__HOST=${REDIS_HOST}
     - PAPERMERGE__REDIS__PORT=${REDIS_PORT}
-    - PAPERMERGE__ELASTICSEARCH__HOSTS=${ES_HOSTS}
-    - PAPERMERGE__ELASTICSEARCH__PORT=${ES_PORT}
     - PAPERMERGE__MAIN__TIMEZONE=${TIMEZONE}
+    # path where xapian index data is stored
+    - PAPERMERGE__SEARCH__PATH=/app/xapian_index
     - DJANGO_SUPERUSER_USERNAME=${SUPERUSER_USERNAME}
     - DJANGO_SUPERUSER_EMAIL=${SUPERUSER_EMAIL}
     - DJANGO_SUPERUSER_PASSWORD=${SUPERUSER_PASSWORD}
@@ -50,7 +51,7 @@ services:
     ports:
       - '6379:6379'
     volumes:
-      - 'redisdata:/data'
+      - redis_data:/data
   traefik:
     image: "traefik:v2.6"
     command:
@@ -69,15 +70,8 @@ services:
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.traefik.rule=Host(`${USE_HOSTNAME}`) && PathPrefix(`/`)"
-  es:
-    image: docker.elastic.co/elasticsearch/elasticsearch:7.16.2
-    environment:
-      - discovery.type=single-node
-      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
-    ports:
-      - 9200:9200
-      - 9300:9300
 volumes:
   postgres_data:
   media_root:
-  redisdata:
+  xapian_index:
+  redis_data: