I think network_mode: host is correct here

docker-compose-hub-server.yml

@@ -1,38 +1,34 @@
-version: "3"
-
-volumes:
-  es01:
-
-services:
-  hub_server:
-    depends_on:
-      - es01
-    image: lbry/hub:latest
-    restart: always
-    ports:
-      - "50051:50051" # rpc port
-    environment:
-      #- TCP_PORT=50051 # should probably have these supported by the go server too
-      #- TCP_HOST=0.0.0.0
-      - ELASTIC_HOST=http://127.0.0.1
-      - ELASTIC_PORT=9200
-  es01:
-    image: docker.elastic.co/elasticsearch/elasticsearch:7.12.1
-    container_name: es01
-    environment:
-      - node.name=es01
-      - discovery.type=single-node
-      - indices.query.bool.max_clause_count=4096
-      - bootstrap.memory_lock=true
-      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"  # no more than 32, remember to disable swap
-      #- "ES_JAVA_OPTS=-Xms8g -Xmx8g"  # no more than 32, remember to disable swap
-    ulimits:
-      memlock:
-        soft: -1
-        hard: -1
-    volumes:
-      - es01:/usr/share/elasticsearch/data
-    ports:
-      - "9200:9200"
-      - "9300:9300"
-      #- 127.0.0.1:9200:9200
+version: "3"
+
+volumes:
+  es01:
+
+services:
+  hub_server:
+    depends_on:
+      - es01
+    image: lbry/hub:latest
+    restart: always
+    environment:
+      #- TCP_PORT=50051 # should probably have these supported by the go server too
+      #- TCP_HOST=0.0.0.0
+      - ELASTIC_HOST=http://127.0.0.1
+      - ELASTIC_PORT=9200
+    network_mode: host
+  es01:
+    image: docker.elastic.co/elasticsearch/elasticsearch:7.12.1
+    container_name: es01
+    environment:
+      - node.name=es01
+      - discovery.type=single-node
+      - indices.query.bool.max_clause_count=4096
+      - bootstrap.memory_lock=true
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"  # no more than 32, remember to disable swap
+      #- "ES_JAVA_OPTS=-Xms8g -Xmx8g"  # no more than 32, remember to disable swap
+    ulimits:
+      memlock:
+        soft: -1
+        hard: -1
+    volumes:
+      - es01:/usr/share/elasticsearch/data
+    network_mode: host

server/search.go

@@ -614,7 +614,11 @@ func (s *Server) Search(ctx context.Context, in *pb.SearchRequest) (*pb.Outputs,
 	if err != nil {
 		log.Fatalln(err)
 	}
-	searchIndices := make([]string, len(indices)-1)
+	var numIndices = 0
+	if len(indices) > 0 {
+		numIndices = len(indices) - 1
+	}
+	searchIndices := make([]string, numIndices)
 	j := 0
 	for i := 0; i < len(indices); i++ {
 		if indices[i] == "claims" {