diff --git a/server/src/test/java/org/opensearch/index/query/TermsQueryBuilderTests.java b/server/src/test/java/org/opensearch/index/query/TermsQueryBuilderTests.java
index 3173bc0d0461e..61f7dc5facebe 100644
--- a/server/src/test/java/org/opensearch/index/query/TermsQueryBuilderTests.java
+++ b/server/src/test/java/org/opensearch/index/query/TermsQueryBuilderTests.java
@@ -34,6 +34,7 @@
 
 import org.apache.lucene.search.BooleanQuery;
 import org.apache.lucene.search.ConstantScoreQuery;
+import org.apache.lucene.search.FieldExistsQuery;
 import org.apache.lucene.search.IndexOrDocValuesQuery;
 import org.apache.lucene.search.MatchAllDocsQuery;
 import org.apache.lucene.search.MatchNoDocsQuery;
@@ -139,6 +140,7 @@ protected void doAssertLuceneQuery(TermsQueryBuilder queryBuilder, Query query,
                     .or(instanceOf(MatchNoDocsQuery.class))
                     .or(instanceOf(IndexOrDocValuesQuery.class))
                     .or(instanceOf(MatchAllDocsQuery.class))
+                    .or(instanceOf(FieldExistsQuery.class))
             );
             if (query instanceof ConstantScoreQuery) {
                 assertThat(((ConstantScoreQuery) query).getQuery(), instanceOf(BooleanQuery.class));