diff --git a/DocumentsFromSnapshotMigration/src/main/java/org/opensearch/migrations/RfsMigrateDocuments.java b/DocumentsFromSnapshotMigration/src/main/java/org/opensearch/migrations/RfsMigrateDocuments.java
index 00951d45fe..c06a159280 100644
--- a/DocumentsFromSnapshotMigration/src/main/java/org/opensearch/migrations/RfsMigrateDocuments.java
+++ b/DocumentsFromSnapshotMigration/src/main/java/org/opensearch/migrations/RfsMigrateDocuments.java
@@ -55,6 +55,12 @@ public class RfsMigrateDocuments {
     public static final int TOLERABLE_CLIENT_SERVER_CLOCK_DIFFERENCE_SECONDS = 5;
     public static final String LOGGING_MDC_WORKER_ID = "workerId";
 
+    private static final String DEFAULT_DOCUMENT_TRANSFORMATION_CONFIG = "[" +
+            "  {" +
+            "    \"JsonTransformerForDocumentTypeRemovalProvider\":\"\"" +
+            "  }" +
+            "]";
+
     public static class DurationConverter implements IStringConverter<Duration> {
         @Override
         public Duration convert(String value) {
@@ -254,12 +260,15 @@ public static void main(String[] args) throws Exception {
 
 
         String docTransformerConfig = TransformerConfigUtils.getTransformerConfig(arguments.docTransformationParams);
-        IJsonTransformer docTransformer = null;
         if (docTransformerConfig != null) {
             log.atInfo().setMessage("Doc Transformations config string: {}")
                     .addArgument(docTransformerConfig).log();
-            docTransformer = new TransformationLoader().getTransformerFactoryLoader(docTransformerConfig);
+        } else {
+            log.atInfo().setMessage("Using default transformation config: {}")
+                    .addArgument(DEFAULT_DOCUMENT_TRANSFORMATION_CONFIG).log();
+            docTransformerConfig = DEFAULT_DOCUMENT_TRANSFORMATION_CONFIG;
         }
+        IJsonTransformer docTransformer = new TransformationLoader().getTransformerFactoryLoader(docTransformerConfig);
 
         try (var processManager = new LeaseExpireTrigger(RfsMigrateDocuments::exitOnLeaseTimeout, Clock.systemUTC());
              var workCoordinator = new OpenSearchWorkCoordinator(
diff --git a/RFS/src/main/java/org/opensearch/migrations/bulkload/common/BulkDocSection.java b/RFS/src/main/java/org/opensearch/migrations/bulkload/common/BulkDocSection.java
index d8db10ec48..3ead6b70ac 100644
--- a/RFS/src/main/java/org/opensearch/migrations/bulkload/common/BulkDocSection.java
+++ b/RFS/src/main/java/org/opensearch/migrations/bulkload/common/BulkDocSection.java
@@ -36,6 +36,8 @@ public class BulkDocSection {
     private final ObjectNode indexCommand;
     private final ObjectNode source;
 
+    private StringBuilder bulkDocSectionStringCache = null;
+
     public BulkDocSection(String id, String indexName, String type, String docBody) {
         this.docId = id;
         this.indexCommand = createIndexCommand(id, indexName, type);
@@ -68,12 +70,17 @@ public static String convertToBulkRequestBody(Collection<BulkDocSection> bulkSec
         return builder.toString();
     }
 
-    public StringBuilder asStringBuilder() {
+    private StringBuilder asStringBuilder() {
+        if (this.bulkDocSectionStringCache != null) {
+            return this.bulkDocSectionStringCache;
+        }
+
         StringBuilder builder = new StringBuilder();
         try {
-            String indexCommand = asBulkIndex();
-            String sourceJson = asBulkSource();
+            String indexCommand = asBulkIndexString();
+            String sourceJson = asBulkSourceString();
             builder.append(indexCommand).append(NEWLINE).append(sourceJson);
+            bulkDocSectionStringCache = builder;
             return builder;
         } catch (JsonProcessingException e) {
             throw new RuntimeException(SERIALIZATION_ERROR_MESSAGE, e);
@@ -84,18 +91,18 @@ public String asString() {
         return asStringBuilder().toString();
     }
 
-    private String asString(ObjectNode node) throws JsonProcessingException {
-        return OBJECT_MAPPER.writeValueAsString(node);
-    }
-
-    private String asBulkIndex() throws JsonProcessingException {
+    private String asBulkIndexString() throws JsonProcessingException {
         return asString(this.indexCommand);
     }
 
-    private String asBulkSource() throws JsonProcessingException {
+    private String asBulkSourceString() throws JsonProcessingException {
         return asString(this.source);
     }
 
+    private String asString(ObjectNode node) throws JsonProcessingException {
+        return OBJECT_MAPPER.writeValueAsString(node);
+    }
+
     @SuppressWarnings("unchecked")
     public Map<String, Object> toMap() {
         var indexMap = OBJECT_MAPPER.convertValue(this.indexCommand, HashMap.class);