diff --git a/core/src/main/java/org/elasticsearch/index/shard/IndexShard.java b/core/src/main/java/org/elasticsearch/index/shard/IndexShard.java
index 768db935308..2cadc1ad24b 100644
--- a/core/src/main/java/org/elasticsearch/index/shard/IndexShard.java
+++ b/core/src/main/java/org/elasticsearch/index/shard/IndexShard.java
@@ -576,16 +576,22 @@ public class IndexShard extends AbstractIndexShardComponent {
             long bytes = getEngine().getIndexBufferRAMBytesUsed();
             writingBytes.addAndGet(bytes);
             try {
-                logger.debug("refresh with source [{}] indexBufferRAMBytesUsed [{}]", source, new ByteSizeValue(bytes));
+                if (logger.isTraceEnabled()) {
+                    logger.trace("refresh with source [{}] indexBufferRAMBytesUsed [{}]", source, new ByteSizeValue(bytes));
+                }
                 long time = System.nanoTime();
                 getEngine().refresh(source);
                 refreshMetric.inc(System.nanoTime() - time);
             } finally {
-                logger.debug("remove [{}] writing bytes for shard [{}]", new ByteSizeValue(bytes), shardId());
+                if (logger.isTraceEnabled()) {
+                    logger.trace("remove [{}] writing bytes for shard [{}]", new ByteSizeValue(bytes), shardId());
+                }
                 writingBytes.addAndGet(-bytes);
             }
         } else {
-            logger.debug("refresh with source [{}]", source);
+            if (logger.isTraceEnabled()) {
+                logger.trace("refresh with source [{}]", source);
+            }
             long time = System.nanoTime();
             getEngine().refresh(source);
             refreshMetric.inc(System.nanoTime() - time);