diff --git a/quickwit/quickwit-cli/src/tool.rs b/quickwit/quickwit-cli/src/tool.rs
index c23d0cdaef4..0236c68acea 100644
--- a/quickwit/quickwit-cli/src/tool.rs
+++ b/quickwit/quickwit-cli/src/tool.rs
@@ -965,6 +965,7 @@ async fn create_empty_cluster(config: &NodeConfig) -> anyhow::Result<Cluster> {
         ingester_status: IngesterStatus::default(),
         availability_zone: None,
         enable_standalone_compactors: false,
+        enable_shard_scaling_v2: false,
     };
     let channel_factory = ChannelFactory::for_grpc(&config.grpc_config)?;
     let cluster = Cluster::join(
diff --git a/quickwit/quickwit-cluster/src/cluster.rs b/quickwit/quickwit-cluster/src/cluster.rs
index 4f2f9c16cb7..c20be1e1bfd 100644
--- a/quickwit/quickwit-cluster/src/cluster.rs
+++ b/quickwit/quickwit-cluster/src/cluster.rs
@@ -42,7 +42,7 @@ use crate::grpc_gossip::spawn_catchup_callback_task;
 use crate::member::{
     AVAILABILITY_ZONE_KEY, ClusterMember, ENABLED_SERVICES_KEY, GRPC_ADVERTISE_ADDR_KEY,
     NodeStateExt, PIPELINE_METRICS_PREFIX, READINESS_KEY, READINESS_VALUE_NOT_READY,
-    READINESS_VALUE_READY, STANDALONE_COMPACTORS_KEY,
+    READINESS_VALUE_READY, SHARD_SCALING_V2_KEY, STANDALONE_COMPACTORS_KEY,
 };
 use crate::metrics::spawn_metrics_task;
 use crate::{ClusterChangeStream, ClusterNode};
@@ -241,6 +241,10 @@ impl Cluster {
             STANDALONE_COMPACTORS_KEY.to_string(),
             self_node.enable_standalone_compactors.to_string(),
         ));
+        initial_key_values.push((
+            SHARD_SCALING_V2_KEY.to_string(),
+            self_node.enable_shard_scaling_v2.to_string(),
+        ));
         let chitchat_handle =
             spawn_chitchat(chitchat_config, initial_key_values, transport).await?;
 
@@ -776,6 +780,7 @@ impl<'a> TestClusterBuilder<'a> {
                 ingester_status: IngesterStatus::default(),
                 availability_zone: None,
                 enable_standalone_compactors: false,
+                enable_shard_scaling_v2: false,
             },
             peer_seed_addrs: Vec::new(),
             transport,
diff --git a/quickwit/quickwit-cluster/src/grpc_service.rs b/quickwit/quickwit-cluster/src/grpc_service.rs
index 752d8330883..f69e8113f24 100644
--- a/quickwit/quickwit-cluster/src/grpc_service.rs
+++ b/quickwit/quickwit-cluster/src/grpc_service.rs
@@ -167,7 +167,7 @@ mod tests {
             .key_values
             .sort_unstable_by(|left, right| left.key.cmp(&right.key));
 
-        assert_eq!(node_state.key_values.len(), 5);
+        assert_eq!(node_state.key_values.len(), 6);
         assert_eq!(node_state.key_values[0].key, ENABLED_SERVICES_KEY);
         assert_eq!(node_state.key_values[0].value, "indexer");
 
@@ -179,8 +179,11 @@ mod tests {
         assert_eq!(node_state.key_values[3].key, READINESS_KEY);
         assert_eq!(node_state.key_values[3].value, "READY");
 
-        assert_eq!(node_state.key_values[4].key, STANDALONE_COMPACTORS_KEY);
+        assert_eq!(node_state.key_values[4].key, "shard_scaling_v2");
         assert_eq!(node_state.key_values[4].value, "false");
+
+        assert_eq!(node_state.key_values[5].key, STANDALONE_COMPACTORS_KEY);
+        assert_eq!(node_state.key_values[5].value, "false");
     }
 
     #[tokio::test]
diff --git a/quickwit/quickwit-cluster/src/lib.rs b/quickwit/quickwit-cluster/src/lib.rs
index 38c65ef43d0..e68c67cee3d 100644
--- a/quickwit/quickwit-cluster/src/lib.rs
+++ b/quickwit/quickwit-cluster/src/lib.rs
@@ -138,6 +138,7 @@ pub async fn start_cluster_service(node_config: &NodeConfig) -> anyhow::Result<C
         ingester_status: IngesterStatus::default(),
         availability_zone: node_config.availability_zone.clone(),
         enable_standalone_compactors: node_config.enable_standalone_compactors,
+        enable_shard_scaling_v2: node_config.enable_shard_scaling_v2,
     };
     let failure_detector_config = FailureDetectorConfig {
         dead_node_grace_period: Duration::from_mins(15),
diff --git a/quickwit/quickwit-cluster/src/member.rs b/quickwit/quickwit-cluster/src/member.rs
index 510b502ccfe..4b30a140fe5 100644
--- a/quickwit/quickwit-cluster/src/member.rs
+++ b/quickwit/quickwit-cluster/src/member.rs
@@ -42,6 +42,8 @@ pub(crate) const AVAILABILITY_ZONE_KEY: &str = "availability_zone";
 
 pub(crate) const STANDALONE_COMPACTORS_KEY: &str = "standalone_compactors";
 
+pub(crate) const SHARD_SCALING_V2_KEY: &str = "shard_scaling_v2";
+
 pub const INDEXING_CPU_CAPACITY_KEY: &str = "indexing_cpu_capacity";
 
 pub(crate) trait NodeStateExt {
@@ -56,6 +58,8 @@ pub(crate) trait NodeStateExt {
     fn availability_zone(&self) -> Option<AvailabilityZone>;
 
     fn enable_standalone_compactors(&self) -> bool;
+
+    fn enable_shard_scaling_v2(&self) -> bool;
 }
 
 impl NodeStateExt for NodeState {
@@ -100,6 +104,10 @@ impl NodeStateExt for NodeState {
     fn enable_standalone_compactors(&self) -> bool {
         matches!(self.get(STANDALONE_COMPACTORS_KEY), Some(value) if value == "true")
     }
+
+    fn enable_shard_scaling_v2(&self) -> bool {
+        matches!(self.get(SHARD_SCALING_V2_KEY), Some(value) if value == "true")
+    }
 }
 
 /// Cluster member.
@@ -135,6 +143,7 @@ pub struct ClusterMember {
     pub availability_zone: Option<AvailabilityZone>,
     /// Whether the node was started with standalone compactors enabled.
     pub enable_standalone_compactors: bool,
+    pub enable_shard_scaling_v2: bool,
 }
 
 impl ClusterMember {
@@ -205,6 +214,7 @@ pub(crate) fn build_cluster_member(
     let ingester_status = node_state.ingester_status();
     let availability_zone = node_state.availability_zone();
     let enable_standalone_compactors = node_state.enable_standalone_compactors();
+    let enable_shard_scaling_v2 = node_state.enable_shard_scaling_v2();
 
     let member = ClusterMember {
         node_id: NodeId::from_arc_str(chitchat_id.node_id.clone()),
@@ -218,6 +228,7 @@ pub(crate) fn build_cluster_member(
         ingester_status,
         availability_zone,
         enable_standalone_compactors,
+        enable_shard_scaling_v2,
     };
     Ok(member)
 }
diff --git a/quickwit/quickwit-cluster/src/node.rs b/quickwit/quickwit-cluster/src/node.rs
index 5189e91776d..33fd55bd81a 100644
--- a/quickwit/quickwit-cluster/src/node.rs
+++ b/quickwit/quickwit-cluster/src/node.rs
@@ -114,6 +114,10 @@ impl ClusterNode {
     pub fn enable_standalone_compactors(&self) -> bool {
         self.inner.member.enable_standalone_compactors
     }
+
+    pub fn enable_shard_scaling_v2(&self) -> bool {
+        self.inner.member.enable_shard_scaling_v2
+    }
 }
 
 impl std::ops::Deref for ClusterNode {
diff --git a/quickwit/quickwit-config/src/node_config/mod.rs b/quickwit/quickwit-config/src/node_config/mod.rs
index 3bd488a2c0f..641cfbb9d72 100644
--- a/quickwit/quickwit-config/src/node_config/mod.rs
+++ b/quickwit/quickwit-config/src/node_config/mod.rs
@@ -932,6 +932,8 @@ pub struct NodeConfig {
     pub compactor_config: CompactorConfig,
     #[serde(skip_serializing)]
     pub enable_standalone_compactors: bool,
+    #[serde(skip_serializing)]
+    pub enable_shard_scaling_v2: bool,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub docs_clustering_config: Option<DocsClusteringConfig>,
 }
diff --git a/quickwit/quickwit-config/src/node_config/serialize.rs b/quickwit/quickwit-config/src/node_config/serialize.rs
index 41936f476a0..7c3e8c34202 100644
--- a/quickwit/quickwit-config/src/node_config/serialize.rs
+++ b/quickwit/quickwit-config/src/node_config/serialize.rs
@@ -216,6 +216,8 @@ struct NodeConfigBuilder {
     default_index_root_uri: ConfigValue<Uri, QW_DEFAULT_INDEX_ROOT_URI>,
     #[serde(default)]
     enable_standalone_compactors: ConfigValue<bool, QW_ENABLE_STANDALONE_COMPACTORS>,
+    #[serde(default)]
+    enable_shard_scaling_v2: ConfigValue<bool, QW_ENABLE_SHARD_SCALING_V2>,
     #[serde(rename = "rest")]
     #[serde(default)]
     rest_config_builder: RestConfigBuilder,
@@ -274,6 +276,7 @@ impl NodeConfigBuilder {
                 });
 
         let enable_standalone_compactors = self.enable_standalone_compactors.resolve(env_vars)?;
+        let enable_shard_scaling_v2 = self.enable_shard_scaling_v2.resolve(env_vars)?;
         let docs_clustering_config =
             DocsClusteringConfigBuilder::build_optional(self.docs_clustering_config, env_vars)?;
 
@@ -406,6 +409,7 @@ impl NodeConfigBuilder {
             jaeger_config: self.jaeger_config,
             compactor_config: self.compactor_config,
             enable_standalone_compactors,
+            enable_shard_scaling_v2,
             docs_clustering_config,
         };
 
@@ -545,6 +549,7 @@ impl Default for NodeConfigBuilder {
             metastore_read_replica_uri: default_metastore_read_replica_uri(),
             default_index_root_uri: ConfigValue::none(),
             enable_standalone_compactors: Default::default(),
+            enable_shard_scaling_v2: Default::default(),
             rest_config_builder: RestConfigBuilder::default(),
             health_config_builder: HealthConfigBuilder::default(),
             grpc_config: GrpcConfig::default(),
@@ -708,6 +713,7 @@ pub fn node_config_for_tests_from_ports(
         jaeger_config: JaegerConfig::default(),
         compactor_config: CompactorConfig::default(),
         enable_standalone_compactors: false,
+        enable_shard_scaling_v2: false,
         docs_clustering_config: None,
     }
 }
diff --git a/quickwit/quickwit-config/src/qw_env_vars.rs b/quickwit/quickwit-config/src/qw_env_vars.rs
index 69c94e48bec..a69151db7ae 100644
--- a/quickwit/quickwit-config/src/qw_env_vars.rs
+++ b/quickwit/quickwit-config/src/qw_env_vars.rs
@@ -48,6 +48,7 @@ qw_env_vars!(
     QW_DATA_DIR,
     QW_DEFAULT_INDEX_ROOT_URI,
     QW_DISABLE_DOCS_CLUSTERING,
+    QW_ENABLE_SHARD_SCALING_V2,
     QW_ENABLED_SERVICES,
     QW_ENABLE_STANDALONE_COMPACTORS,
     QW_EXTRA_CLUSTER_IDS,
@@ -80,9 +81,9 @@ mod tests {
             QW_ENV_VARS.get(&QW_METASTORE_READ_REPLICA_URI).unwrap(),
             &"QW_METASTORE_READ_REPLICA_URI"
         );
-        assert_eq!(QW_METASTORE_READ_REPLICA_URI, 16);
+        assert_eq!(QW_METASTORE_READ_REPLICA_URI, 17);
 
         assert_eq!(QW_ENV_VARS.get(&QW_NODE_ID).unwrap(), &"QW_NODE_ID");
-        assert_eq!(QW_NODE_ID, 18);
+        assert_eq!(QW_NODE_ID, 19);
     }
 }
diff --git a/quickwit/quickwit-control-plane/src/control_plane.rs b/quickwit/quickwit-control-plane/src/control_plane.rs
index 793f5d3b066..4dd0ff6c3e8 100644
--- a/quickwit/quickwit-control-plane/src/control_plane.rs
+++ b/quickwit/quickwit-control-plane/src/control_plane.rs
@@ -2169,6 +2169,7 @@ mod tests {
                 status: IngesterStatus::Retiring,
                 availability_zone: None,
                 generation_id: quickwit_cluster::GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
         ingester_pool.insert(
diff --git a/quickwit/quickwit-control-plane/src/ingest/ingest_controller.rs b/quickwit/quickwit-control-plane/src/ingest/ingest_controller.rs
index e8975068e03..f4112d07be6 100644
--- a/quickwit/quickwit-control-plane/src/ingest/ingest_controller.rs
+++ b/quickwit/quickwit-control-plane/src/ingest/ingest_controller.rs
@@ -395,6 +395,13 @@ impl IngestController {
         }
     }
 
+    pub(crate) fn all_indexers_migrated(&self) -> bool {
+        self.ingester_pool
+            .keys_values()
+            .iter()
+            .all(|(_node_id, ingester)| ingester.enable_shard_scaling_v2)
+    }
+
     /// Sends a retain shard request to the given list of ingesters.
     ///
     /// If the request fails, we just log an error.
@@ -1273,6 +1280,7 @@ mod tests {
             status,
             availability_zone: availability_zone.map(AvailabilityZone::from),
             generation_id: GenerationId::from(1u64),
+            enable_shard_scaling_v2: false,
         }
     }
 
@@ -1681,6 +1689,7 @@ mod tests {
                 status: IngesterStatus::Retiring,
                 availability_zone: None,
                 generation_id: quickwit_cluster::GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
         let open_shard_opt =
@@ -2253,6 +2262,7 @@ mod tests {
                     status: IngesterStatus::Ready,
                     availability_zone: Some(AvailabilityZone::from(zone)),
                     generation_id: GenerationId::from(1u64),
+                    enable_shard_scaling_v2: false,
                 },
             );
         }
@@ -3013,6 +3023,7 @@ mod tests {
                 status: IngesterStatus::Ready,
                 availability_zone: None,
                 generation_id: quickwit_cluster::GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             };
             ingester_pool.insert(NodeId::from_str(ingester_id), ingester);
         }
@@ -3031,6 +3042,7 @@ mod tests {
                 status: IngesterStatus::Retiring,
                 availability_zone: None,
                 generation_id: quickwit_cluster::GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             };
             ingester_pool.insert(NodeId::from_str(ingester_id), ingester);
         }
@@ -3169,6 +3181,7 @@ mod tests {
                     status: IngesterStatus::Decommissioned,
                     availability_zone: None,
                     generation_id: quickwit_cluster::GenerationId::from(1u64),
+                    enable_shard_scaling_v2: false,
                 };
                 ingester_pool.insert(NodeId::from_str(ingester_id), ingester);
             }
diff --git a/quickwit/quickwit-ingest/src/ingest_v2/mod.rs b/quickwit/quickwit-ingest/src/ingest_v2/mod.rs
index 7e00eff563e..14e56647340 100644
--- a/quickwit/quickwit-ingest/src/ingest_v2/mod.rs
+++ b/quickwit/quickwit-ingest/src/ingest_v2/mod.rs
@@ -70,6 +70,7 @@ pub struct IngesterPoolEntry {
     pub status: IngesterStatus,
     pub availability_zone: Option<AvailabilityZone>,
     pub generation_id: GenerationId,
+    pub enable_shard_scaling_v2: bool,
 }
 
 impl IngesterPoolEntry {
@@ -80,6 +81,7 @@ impl IngesterPoolEntry {
             status: IngesterStatus::Ready,
             availability_zone: None,
             generation_id: GenerationId::from(1u64),
+            enable_shard_scaling_v2: false,
         }
     }
 
@@ -90,6 +92,7 @@ impl IngesterPoolEntry {
             status: IngesterStatus::Ready,
             availability_zone: None,
             generation_id: GenerationId::from(1u64),
+            enable_shard_scaling_v2: false,
         }
     }
 }
diff --git a/quickwit/quickwit-ingest/src/ingest_v2/router.rs b/quickwit/quickwit-ingest/src/ingest_v2/router.rs
index d39641133fa..52f73cc1707 100644
--- a/quickwit/quickwit-ingest/src/ingest_v2/router.rs
+++ b/quickwit/quickwit-ingest/src/ingest_v2/router.rs
@@ -1368,6 +1368,7 @@ mod tests {
                 status: IngesterStatus::Ready,
                 availability_zone: None,
                 generation_id: GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
 
@@ -1405,6 +1406,7 @@ mod tests {
                 availability_zone: None,
                 status: IngesterStatus::Ready,
                 generation_id: GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
 
@@ -1531,6 +1533,7 @@ mod tests {
                 status: IngesterStatus::Ready,
                 availability_zone: None,
                 generation_id: GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
 
@@ -1692,6 +1695,7 @@ mod tests {
                 availability_zone: None,
                 status: IngesterStatus::Ready,
                 generation_id: GenerationId::from(1u64),
+                enable_shard_scaling_v2: false,
             },
         );
 
@@ -1757,6 +1761,7 @@ mod tests {
             NodeId::from_str("test-ingester-0"),
             IngesterPoolEntry {
                 generation_id: GenerationId::from(2u64),
+                enable_shard_scaling_v2: false,
                 ..IngesterPoolEntry::mocked_ingester()
             },
         );
@@ -1912,6 +1917,7 @@ mod tests {
             NodeId::from_str("test-ingester-0"),
             IngesterPoolEntry {
                 generation_id: GenerationId::from(3u64),
+                enable_shard_scaling_v2: false,
                 ..IngesterPoolEntry::mocked_ingester()
             },
         );
@@ -1929,6 +1935,7 @@ mod tests {
             NodeId::from_str("test-ingester-0"),
             IngesterPoolEntry {
                 generation_id: GenerationId::from(7u64),
+                enable_shard_scaling_v2: false,
                 ..IngesterPoolEntry::mocked_ingester()
             },
         );
diff --git a/quickwit/quickwit-ingest/src/ingest_v2/routing_table.rs b/quickwit/quickwit-ingest/src/ingest_v2/routing_table.rs
index f774318fd71..b97be41dacc 100644
--- a/quickwit/quickwit-ingest/src/ingest_v2/routing_table.rs
+++ b/quickwit/quickwit-ingest/src/ingest_v2/routing_table.rs
@@ -364,6 +364,7 @@ mod tests {
             status: IngesterStatus::Ready,
             availability_zone: availability_zone.map(AvailabilityZone::from),
             generation_id: GenerationId::from(1u64),
+            enable_shard_scaling_v2: false,
         }
     }
 
diff --git a/quickwit/quickwit-serve/src/lib.rs b/quickwit/quickwit-serve/src/lib.rs
index 966ce0ec44a..d081b46a7a8 100644
--- a/quickwit/quickwit-serve/src/lib.rs
+++ b/quickwit/quickwit-serve/src/lib.rs
@@ -1280,6 +1280,7 @@ fn build_ingester_insert_change(
         status: node.ingester_status,
         availability_zone: node.availability_zone(),
         generation_id: node.generation_id,
+        enable_shard_scaling_v2: node.enable_shard_scaling_v2(),
     };
     Change::Insert(node_id, pool_entry)
 }