fix: forgot to include a setter with my getter

Author: barabo

src/main/java/ca/uhn/fhir/jpa/starter/AppProperties.java

@@ -325,14 +325,18 @@ public void setAllow_override_default_search_params(
     this.allow_override_default_search_params = allow_override_default_search_params;
   }
 
-  public Boolean getAuto_create_placeholder_reference_targets() {
-    return auto_create_placeholder_reference_targets;
-  }
-
   public Boolean getEnable_mass_ingestion_mode() {
     return enable_mass_ingestion_mode;
   }
 
+  public void setEnable_mass_ingestion_mode(Boolean enable_mass_ingestion_mode) {
+    this.enable_mass_ingestion_mode = enable_mass_ingestion_mode;
+  }
+
+  public Boolean getAuto_create_placeholder_reference_targets() {
+    return auto_create_placeholder_reference_targets;
+  }
+
   public void setAuto_create_placeholder_reference_targets(
     Boolean auto_create_placeholder_reference_targets) {
     this.auto_create_placeholder_reference_targets = auto_create_placeholder_reference_targets;