diff --git a/server/src/test/java/org/opensearch/index/engine/InternalEngineTests.java b/server/src/test/java/org/opensearch/index/engine/InternalEngineTests.java
index 305c3a3acbf75..81d8bccb86c60 100644
--- a/server/src/test/java/org/opensearch/index/engine/InternalEngineTests.java
+++ b/server/src/test/java/org/opensearch/index/engine/InternalEngineTests.java
@@ -40,7 +40,6 @@
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.core.appender.AbstractAppender;
 import org.apache.logging.log4j.core.filter.RegexFilter;
-import org.apache.lucene.codecs.LiveDocsFormat;
 import org.apache.lucene.document.Field;
 import org.apache.lucene.document.KeywordField;
 import org.apache.lucene.document.LongPoint;
@@ -3237,22 +3236,10 @@ public void testUnreferencedFileCleanUpOnSegmentMergeFailureWithCleanUpEnabled()
         MockDirectoryWrapper wrapper = newMockDirectory();
         final CountDownLatch cleanupCompleted = new CountDownLatch(1);
         MockDirectoryWrapper.Failure fail = new MockDirectoryWrapper.Failure() {
-            public boolean didFail1;
-            public boolean didFail2;
-
             @Override
             public void eval(MockDirectoryWrapper dir) throws IOException {
-                if (!doFail) {
-                    return;
-                }
-
-                // Fail segment merge with diskfull during merging terms.
-                if (callStackContainsAnyOf("mergeTerms") && !didFail1) {
-                    didFail1 = true;
-                    throw new IOException("No space left on device");
-                }
-                if (callStackContains(LiveDocsFormat.class, "writeLiveDocs") && !didFail2) {
-                    didFail2 = true;
+                // Fail segment merge with diskfull during merging terms
+                if (callStackContainsAnyOf("mergeTerms")) {
                     throw new IOException("No space left on device");
                 }
             }
@@ -3325,7 +3312,6 @@ public void onFailedEngine(String reason, Exception e) {
             segments = engine.segments(false);
             assertThat(segments.size(), equalTo(2));
 
-            fail.setDoFail();
             // IndexWriter can throw either IOException or IllegalStateException depending on whether tragedy is set or not.
             expectThrowsAnyOf(
                 Arrays.asList(IOException.class, IllegalStateException.class),
@@ -3345,20 +3331,10 @@ public void testUnreferencedFileCleanUpOnSegmentMergeFailureWithCleanUpDisabled(
         MockDirectoryWrapper wrapper = newMockDirectory();
         final CountDownLatch cleanupCompleted = new CountDownLatch(1);
         MockDirectoryWrapper.Failure fail = new MockDirectoryWrapper.Failure() {
-            public boolean didFail1;
-            public boolean didFail2;
 
             @Override
             public void eval(MockDirectoryWrapper dir) throws IOException {
-                if (!doFail) {
-                    return;
-                }
-                if (callStackContainsAnyOf("mergeTerms") && !didFail1) {
-                    didFail1 = true;
-                    throw new IOException("No space left on device");
-                }
-                if (callStackContains(LiveDocsFormat.class, "writeLiveDocs") && !didFail2) {
-                    didFail2 = true;
+                if (callStackContainsAnyOf("mergeTerms")) {
                     throw new IOException("No space left on device");
                 }
             }
@@ -3439,7 +3415,6 @@ public void onFailedEngine(String reason, Exception e) {
             segments = engine.segments(false);
             assertThat(segments.size(), equalTo(2));
 
-            fail.setDoFail();
             // IndexWriter can throw either IOException or IllegalStateException depending on whether tragedy is set or not.
             expectThrowsAnyOf(
                 Arrays.asList(IOException.class, IllegalStateException.class),
@@ -3459,20 +3434,10 @@ public void testUnreferencedFileCleanUpFailsOnSegmentMergeFailureWhenDirectoryCl
         MockDirectoryWrapper wrapper = newMockDirectory();
         final CountDownLatch cleanupCompleted = new CountDownLatch(1);
         MockDirectoryWrapper.Failure fail = new MockDirectoryWrapper.Failure() {
-            public boolean didFail1;
-            public boolean didFail2;
 
             @Override
             public void eval(MockDirectoryWrapper dir) throws IOException {
-                if (!doFail) {
-                    return;
-                }
-                if (callStackContainsAnyOf("mergeTerms") && !didFail1) {
-                    didFail1 = true;
-                    throw new IOException("No space left on device");
-                }
-                if (callStackContains(LiveDocsFormat.class, "writeLiveDocs") && !didFail2) {
-                    didFail2 = true;
+                if (callStackContainsAnyOf("mergeTerms")) {
                     throw new IOException("No space left on device");
                 }
             }
@@ -3537,7 +3502,6 @@ public void onFailedEngine(String reason, Exception e) {
             segments = engine.segments(false);
             assertThat(segments.size(), equalTo(2));
 
-            fail.setDoFail();
             // Close the store so that unreferenced file cleanup will fail.
             store.close();