diff --git a/config/config.md b/config/config.md
index b4fb40c477..a717b0d613 100644
--- a/config/config.md
+++ b/config/config.md
@@ -514,7 +514,7 @@
 | `wal.timeout` | String | `3s` | The timeout for kafka client.<br/>**It's only used when the provider is `kafka`**. |
 | `wal.max_batch_bytes` | String | `1MB` | The max size of a single producer batch.<br/>Warning: Kafka has a default limit of 1MB per message in a topic.<br/>**It's only used when the provider is `kafka`**. |
 | `wal.consumer_wait_timeout` | String | `100ms` | The consumer wait timeout.<br/>**It's only used when the provider is `kafka`**. |
-| `wal.create_index` | Bool | `true` | Whether to enable WAL index creation.<br/>**It's only used when the provider is `kafka`**. |
+| `wal.create_index` | Bool | `false` | Whether to enable WAL index creation.<br/>**It's only used when the provider is `kafka`**. |
 | `wal.dump_index_interval` | String | `60s` | The interval for dumping WAL indexes.<br/>**It's only used when the provider is `kafka`**. |
 | `wal.overwrite_entry_start_id` | Bool | `false` | Ignore missing entries during read WAL.<br/>**It's only used when the provider is `kafka`**.<br/><br/>This option ensures that when Kafka messages are deleted, the system<br/>can still successfully replay memtable data without throwing an<br/>out-of-range error.<br/>However, enabling this option might lead to unexpected data loss,<br/>as the system will skip over missing entries instead of treating<br/>them as critical errors. |
 | `query` | -- | -- | The query engine options. |
diff --git a/config/datanode.example.toml b/config/datanode.example.toml
index 678af44376..7a5a486bbe 100644
--- a/config/datanode.example.toml
+++ b/config/datanode.example.toml
@@ -185,7 +185,7 @@ consumer_wait_timeout = "100ms"
 
 ## Whether to enable WAL index creation.
 ## **It's only used when the provider is `kafka`**.
-create_index = true
+create_index = false
 
 ## The interval for dumping WAL indexes.
 ## **It's only used when the provider is `kafka`**.
diff --git a/src/common/wal/src/config/kafka/datanode.rs b/src/common/wal/src/config/kafka/datanode.rs
index 374a7229d4..4003b52e4b 100644
--- a/src/common/wal/src/config/kafka/datanode.rs
+++ b/src/common/wal/src/config/kafka/datanode.rs
@@ -60,7 +60,7 @@ impl Default for DatanodeKafkaConfig {
             consumer_wait_timeout: Duration::from_millis(100),
             kafka_topic: KafkaTopicConfig::default(),
             auto_create_topics: true,
-            create_index: true,
+            create_index: false,
             dump_index_interval: Duration::from_secs(60),
             topic_latest_offset_fetch_interval: DEFAULT_TOPIC_LATEST_OFFSET_FETCH_INTERVAL,
             overwrite_entry_start_id: false,