diff --git a/Cargo.lock b/Cargo.lock
index 7dad604070..734d4a5984 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1427,12 +1427,6 @@ dependencies = [
  "wasm-bindgen",
 ]
 
-[[package]]
-name = "json"
-version = "0.12.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "078e285eafdfb6c4b434e0d31e8cfcb5115b651496faca5749b88fafd4f23bfd"
-
 [[package]]
 name = "kv"
 version = "0.24.0"
@@ -1620,12 +1614,12 @@ dependencies = [
 
 [[package]]
 name = "mrflagly"
-version = "0.2.9"
+version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58e76b314a1e3d1fdf11a06ec8d1ccd9fc7cda2f2dfb049884060d63259e359a"
+checksum = "7c7726efd230cd3586667788b847eac583931319a11429ca6ca67f06fb75a829"
 dependencies = [
  "httptest",
- "json",
+ "serde_json",
  "ureq",
 ]
 
@@ -2405,7 +2399,7 @@ dependencies = [
  "indoc",
  "libc",
  "memoffset",
- "parking_lot 0.12.2",
+ "parking_lot 0.11.2",
  "pyo3-build-config",
  "pyo3-ffi",
  "pyo3-macros",
@@ -3096,11 +3090,12 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.117"
+version = "1.0.128"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "455182ea6142b14f93f4bc5320a2b31c1f266b66a4a5c858b013302a5d8cbfc3"
+checksum = "6ff5456707a1de34e7e37f2a6fd3d3f808c318259cbd01ab6377795054b483d8"
 dependencies = [
  "itoa",
+ "memchr",
  "ryu",
  "serde",
 ]
diff --git a/nucliadb_node/src/shards/shard_writer.rs b/nucliadb_node/src/shards/shard_writer.rs
index 1c873f6886..44646b7a49 100644
--- a/nucliadb_node/src/shards/shard_writer.rs
+++ b/nucliadb_node/src/shards/shard_writer.rs
@@ -37,7 +37,7 @@ use super::indexes::{ShardIndexes, DEFAULT_VECTORS_INDEX_NAME};
 use super::metadata::ShardMetadata;
 use super::versioning::{self, Versions};
 use crate::disk_structure::{self, *};
-use crate::settings::{feature_flags, Settings};
+use crate::settings::Settings;
 use crate::telemetry::run_with_telemetry;
 
 const MAX_LABEL_LENGTH: usize = 32768; // Tantivy max is 2^16 - 4
@@ -106,7 +106,7 @@ impl ShardWriter {
     }
 
     #[measure(actor = "shard", metric = "new")]
-    pub fn new(new: NewShard, shards_path: &Path, settings: &Settings) -> NodeResult<(Self, Arc<ShardMetadata>)> {
+    pub fn new(new: NewShard, shards_path: &Path, _settings: &Settings) -> NodeResult<(Self, Arc<ShardMetadata>)> {
         let span = tracing::Span::current();
 
         if new.vector_configs.is_empty() {
@@ -120,7 +120,6 @@ impl ShardWriter {
 
         std::fs::create_dir(&shard_path)?;
 
-        let ff_context = HashMap::from([("kbid".to_string(), metadata.kbid())]);
         let versions = Versions {
             paragraphs: versioning::PARAGRAPHS_VERSION,
             vectors: versioning::VECTORS_VERSION,