Added support for $lastn operation and fixed Elasticsearch indexing.

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

@@ -62,6 +62,8 @@ public class AppProperties {
   private Partitioning partitioning = null;
   private List<ImplementationGuide> implementationGuides = null;
 
+  private Boolean lastn_enabled = false;
+
   public Integer getDefer_indexing_for_codesystems_of_size() {
     return defer_indexing_for_codesystems_of_size;
   }
@@ -382,6 +384,14 @@ public class AppProperties {
     this.narrative_enabled = narrative_enabled;
   }
 
+  public Boolean getLastn_enabled() {
+    return lastn_enabled;
+  }
+
+  public void setLastn_enabled(Boolean lastn_enabled) {
+    this.lastn_enabled = lastn_enabled;
+  }
+
   public static class Cors {
     private Boolean allow_Credentials = true;
     private List<String> allowed_origin = ImmutableList.of("*");