diff --git a/app/controllers/dois_controller.rb b/app/controllers/dois_controller.rb
index 9307788b8..08eb6691b 100644
--- a/app/controllers/dois_controller.rb
+++ b/app/controllers/dois_controller.rb
@@ -190,7 +190,17 @@ def index
           }
 
           bmr = Benchmark.ms {
-            render json: DoiSerializer.new(results, options).serialized_json, status: :ok
+            logger.info params[:fields]
+            # support sparse fieldsets
+            if params[:fields]
+              f = params.to_unsafe_h.dig(:fields)
+              f = { dois: "doi" } unless f.is_a?(Hash)
+              f.each { |k, v| f[k] = v.split(",") }
+              
+              render json: DoiSerializer.new(results, options.merge(fields: f)).serialized_json, status: :ok
+            else
+              render json: DoiSerializer.new(results, options).serialized_json, status: :ok
+            end
           }
           
           if bmr > 3000
diff --git a/docker-compose.yml b/docker-compose.yml
index 1f0a67b8e..ef9884995 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -44,7 +44,7 @@ services:
       - "9301:9300"
     environment:
       discovery.type: single-node
-      ES_JAVA_OPTS: -Xms1g -Xmx1g
+      ES_JAVA_OPTS: -Xms512m -Xmx512m
       ELASTIC_PASSWORD: changeme
       xpack.security.enabled: "false"
       http.cors.enabled: "true"