diff --git a/src/core/index.rs b/src/core/index.rs
index 8b7222a9a..5e639a70a 100644
--- a/src/core/index.rs
+++ b/src/core/index.rs
@@ -21,7 +21,6 @@ use crate::schema::FieldType;
 use crate::schema::Schema;
 use crate::tokenizer::{TextAnalyzer, TokenizerManager};
 use crate::IndexWriter;
-use num_cpus;
 use std::borrow::BorrowMut;
 use std::collections::HashSet;
 use std::fmt;
diff --git a/src/core/index_meta.rs b/src/core/index_meta.rs
index 4b257667d..a117b5c19 100644
--- a/src/core/index_meta.rs
+++ b/src/core/index_meta.rs
@@ -3,9 +3,7 @@ use crate::core::SegmentId;
 use crate::schema::Schema;
 use crate::Opstamp;
 use census::{Inventory, TrackedObject};
-use serde;
 use serde::{Deserialize, Serialize};
-use serde_json;
 use std::collections::HashSet;
 use std::fmt;
 use std::path::PathBuf;
diff --git a/src/directory/managed_directory.rs b/src/directory/managed_directory.rs
index 5b1698d2c..37f68f571 100644
--- a/src/directory/managed_directory.rs
+++ b/src/directory/managed_directory.rs
@@ -11,7 +11,6 @@ use crate::error::DataCorruption;
 use crate::Directory;
 
 use crc32fast::Hasher;
-use serde_json;
 use std::collections::HashSet;
 use std::io;
 use std::io::Write;
diff --git a/src/directory/mmap_directory.rs b/src/directory/mmap_directory.rs
index 03103e174..173e394e5 100644
--- a/src/directory/mmap_directory.rs
+++ b/src/directory/mmap_directory.rs
@@ -1,10 +1,3 @@
-use fs2;
-use notify;
-
-use self::fs2::FileExt;
-use self::notify::RawEvent;
-use self::notify::RecursiveMode;
-use self::notify::Watcher;
 use crate::core::META_FILEPATH;
 use crate::directory::error::LockError;
 use crate::directory::error::{
@@ -20,8 +13,11 @@ use crate::directory::WatchCallback;
 use crate::directory::WatchCallbackList;
 use crate::directory::WatchHandle;
 use crate::directory::{TerminatingWrite, WritePtr};
-use atomicwrites;
+use fs2::FileExt;
 use memmap::Mmap;
+use notify::RawEvent;
+use notify::RecursiveMode;
+use notify::Watcher;
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::convert::From;
diff --git a/src/error.rs b/src/error.rs
index c4752141b..654768952 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -7,7 +7,6 @@ use crate::directory::error::{Incompatibility, LockError};
 use crate::fastfield::FastFieldNotAvailableError;
 use crate::query;
 use crate::schema;
-use serde_json;
 use std::fmt;
 use std::path::PathBuf;
 use std::sync::PoisonError;
diff --git a/src/indexer/segment_updater.rs b/src/indexer/segment_updater.rs
index 69607a0ce..14cdb628a 100644
--- a/src/indexer/segment_updater.rs
+++ b/src/indexer/segment_updater.rs
@@ -23,7 +23,6 @@ use futures::channel::oneshot;
 use futures::executor::{ThreadPool, ThreadPoolBuilder};
 use futures::future::Future;
 use futures::future::TryFutureExt;
-use serde_json;
 use std::borrow::BorrowMut;
 use std::collections::HashSet;
 use std::io::Write;
diff --git a/src/postings/stacker/term_hashmap.rs b/src/postings/stacker/term_hashmap.rs
index f72704880..6ae135c25 100644
--- a/src/postings/stacker/term_hashmap.rs
+++ b/src/postings/stacker/term_hashmap.rs
@@ -1,6 +1,4 @@
-use murmurhash32;
-
-use self::murmurhash32::murmurhash2;
+use murmurhash32::murmurhash2;
 
 use super::{Addr, MemoryArena};
 use crate::postings::stacker::memory_arena::store;
diff --git a/src/schema/document.rs b/src/schema/document.rs
index 39808402f..94f03ae10 100644
--- a/src/schema/document.rs
+++ b/src/schema/document.rs
@@ -3,7 +3,6 @@ use crate::common::BinarySerializable;
 use crate::common::VInt;
 use crate::tokenizer::PreTokenizedString;
 use crate::DateTime;
-use serde;
 use std::io::{self, Read, Write};
 use std::mem;
 
diff --git a/src/schema/field.rs b/src/schema/field.rs
index efcb78f9b..4698ecb47 100644
--- a/src/schema/field.rs
+++ b/src/schema/field.rs
@@ -1,5 +1,4 @@
 use crate::common::BinarySerializable;
-use serde;
 use std::io;
 use std::io::Read;
 use std::io::Write;
diff --git a/src/schema/field_value.rs b/src/schema/field_value.rs
index a6f9e0924..1d1b7ec7f 100644
--- a/src/schema/field_value.rs
+++ b/src/schema/field_value.rs
@@ -1,10 +1,7 @@
 use crate::common::BinarySerializable;
 use crate::schema::Field;
 use crate::schema::Value;
-use serde;
-use std::io;
-use std::io::Read;
-use std::io::Write;
+use std::io::{self, Read, Write};
 
 /// `FieldValue` holds together a `Field` and its `Value`.
 #[derive(Debug, Clone, Ord, PartialEq, Eq, PartialOrd, serde::Serialize, serde::Deserialize)]
diff --git a/src/store/compression_snap.rs b/src/store/compression_snap.rs
index f7d084747..43e19eb85 100644
--- a/src/store/compression_snap.rs
+++ b/src/store/compression_snap.rs
@@ -1,5 +1,3 @@
-use snap;
-
 use std::io::{self, Read, Write};
 
 /// Name of the compression scheme used in the doc store.
diff --git a/src/termdict/mod.rs b/src/termdict/mod.rs
index 671ec25ae..25da4b04e 100644
--- a/src/termdict/mod.rs
+++ b/src/termdict/mod.rs
@@ -434,8 +434,8 @@ mod tests {
 
     #[test]
     fn test_automaton_search() {
-        use levenshtein_automata::LevenshteinAutomatonBuilder;
         use crate::query::DFAWrapper;
+        use levenshtein_automata::LevenshteinAutomatonBuilder;
 
         const COUNTRIES: [&'static str; 7] = [
             "San Marino",
diff --git a/src/termdict/termdict.rs b/src/termdict/termdict.rs
index 13d0b759a..1330a11c3 100644
--- a/src/termdict/termdict.rs
+++ b/src/termdict/termdict.rs
@@ -7,7 +7,6 @@ use crate::postings::TermInfo;
 use crate::termdict::TermOrdinal;
 use once_cell::sync::Lazy;
 use std::io::{self, Write};
-use tantivy_fst;
 use tantivy_fst::raw::Fst;
 use tantivy_fst::Automaton;