From 6878c0121fb471be4e4dc7ef6a7f78256a1998d7 Mon Sep 17 00:00:00 2001
From: zhichao-aws <zhichaog@amazon.com>
Date: Mon, 25 Sep 2023 20:52:25 +0800
Subject: [PATCH] null check

Signed-off-by: zhichao-aws <zhichaog@amazon.com>
---
 .../neuralsearch/query/SparseEncodingQueryBuilder.java          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/opensearch/neuralsearch/query/SparseEncodingQueryBuilder.java b/src/main/java/org/opensearch/neuralsearch/query/SparseEncodingQueryBuilder.java
index f75a56b50..3da98a186 100644
--- a/src/main/java/org/opensearch/neuralsearch/query/SparseEncodingQueryBuilder.java
+++ b/src/main/java/org/opensearch/neuralsearch/query/SparseEncodingQueryBuilder.java
@@ -266,7 +266,7 @@ private static void validateForRewrite(String queryText, String modelId) {
     }
 
     private static void validateFieldType(MappedFieldType fieldType) {
-        if (!fieldType.typeName().equals("rank_features")) {
+        if (null == fieldType || !fieldType.typeName().equals("rank_features")) {
             throw new IllegalArgumentException(
                 "[" + NAME + "] query only works on [rank_features] fields, " + "not [" + fieldType.typeName() + "]"
             );