diff --git a/src/ui/public/utils/lodash-mixins/__tests__/_move.js b/src/ui/public/utils/lodash-mixins/__tests__/_move.js
index f041849c687e..f80dc56ee586 100644
--- a/src/ui/public/utils/lodash-mixins/__tests__/_move.js
+++ b/src/ui/public/utils/lodash-mixins/__tests__/_move.js
@@ -3,7 +3,7 @@ import expect from 'expect.js';
 describe('_.move', function () {
 
   it('accepts previous from->to syntax', function () {
-    let list = [
+    const list = [
       1,
       1,
       1,
@@ -27,7 +27,7 @@ describe('_.move', function () {
   });
 
   it('moves an object up based on a function callback', function () {
-    let list = [
+    const list = [
       1,
       1,
       1,
@@ -55,7 +55,7 @@ describe('_.move', function () {
   });
 
   it('moves an object down based on a function callback', function () {
-    let list = [
+    const list = [
       1,
       1,
       1,
@@ -83,7 +83,7 @@ describe('_.move', function () {
   });
 
   it('moves an object up based on a where callback', function () {
-    let list = [
+    const list = [
       { v: 1 },
       { v: 1 },
       { v: 1 },
@@ -110,7 +110,7 @@ describe('_.move', function () {
 
 
   it('moves an object up based on a where callback', function () {
-    let list = [
+    const list = [
       { v: 1 },
       { v: 1 },
       { v: 1 },
@@ -136,7 +136,7 @@ describe('_.move', function () {
   });
 
   it('moves an object down based on a pluck callback', function () {
-    let list = [
+    const list = [
       { id: 0, normal: true },
       { id: 1, normal: true },
       { id: 2, normal: true },
diff --git a/src/ui/public/utils/lodash-mixins/__tests__/_organize_by.js b/src/ui/public/utils/lodash-mixins/__tests__/_organize_by.js
index 3f45863ec0de..22c9f5911bca 100644
--- a/src/ui/public/utils/lodash-mixins/__tests__/_organize_by.js
+++ b/src/ui/public/utils/lodash-mixins/__tests__/_organize_by.js
@@ -3,7 +3,7 @@ import expect from 'expect.js';
 describe('_.organize', function () {
 
   it('it works', function () {
-    let col = [
+    const col = [
       {
         name: 'one',
         roles: ['user', 'admin', 'owner']
@@ -22,7 +22,7 @@ describe('_.organize', function () {
       }
     ];
 
-    let resp = _.organizeBy(col, 'roles');
+    const resp = _.organizeBy(col, 'roles');
     expect(resp).to.have.property('user');
     expect(resp.user).to.have.length(4);
 
@@ -34,15 +34,15 @@ describe('_.organize', function () {
   });
 
   it('behaves just like groupBy in normal scenarios', function () {
-    let col = [
+    const col = [
       { name: 'one' },
       { name: 'two' },
       { name: 'three' },
       { name: 'four' }
     ];
 
-    let orgs = _.organizeBy(col, 'name');
-    let groups = _.groupBy(col, 'name');
+    const orgs = _.organizeBy(col, 'name');
+    const groups = _.groupBy(col, 'name');
     expect(orgs).to.eql(groups);
   });
 });
diff --git a/src/ui/public/utils/lodash-mixins/__tests__/_push_all.js b/src/ui/public/utils/lodash-mixins/__tests__/_push_all.js
index edf624b5cfa1..b6db6512e217 100644
--- a/src/ui/public/utils/lodash-mixins/__tests__/_push_all.js
+++ b/src/ui/public/utils/lodash-mixins/__tests__/_push_all.js
@@ -3,10 +3,10 @@ import expect from 'expect.js';
 describe('_.pushAll', function () {
 
   it('pushes an entire array into another', function () {
-    let a = [1, 2, 3, 4];
-    let b = [5, 6, 7, 8];
+    const a = [1, 2, 3, 4];
+    const b = [5, 6, 7, 8];
 
-    let output = _.pushAll(b, a);
+    const output = _.pushAll(b, a);
     expect(output).to.be(a);
     expect(a).to.eql([1, 2, 3, 4, 5, 6, 7, 8]);
     expect(b).to.eql([5, 6, 7, 8]);
diff --git a/src/ui/public/utils/lodash-mixins/collection.js b/src/ui/public/utils/lodash-mixins/collection.js
index 469821df0223..f2c504128129 100644
--- a/src/ui/public/utils/lodash-mixins/collection.js
+++ b/src/ui/public/utils/lodash-mixins/collection.js
@@ -15,7 +15,7 @@ export default function (_) {
      * @return {array} - the objs argument
      */
     move: function (objs, obj, below, qualifier) {
-      var origI = _.isNumber(obj) ? obj : objs.indexOf(obj);
+      const origI = _.isNumber(obj) ? obj : objs.indexOf(obj);
       if (origI === -1) return objs;
 
       if (_.isNumber(below)) {
@@ -27,11 +27,11 @@ export default function (_) {
       below = !!below;
       qualifier = _.callback(qualifier);
 
-      var above = !below;
-      var finder = below ? _.findIndex : _.findLastIndex;
+      const above = !below;
+      const finder = below ? _.findIndex : _.findLastIndex;
 
       // find the index of the next/previous obj that meets the qualifications
-      var targetI = finder(objs, function (otherAgg, otherI) {
+      const targetI = finder(objs, function (otherAgg, otherI) {
         if (below && otherI <= origI) return;
         if (above && otherI >= origI) return;
         return !!qualifier(otherAgg, otherI);
@@ -58,8 +58,8 @@ export default function (_) {
      * @return {object}
      */
     organizeBy: function (collection, callback) {
-      var buckets = {};
-      var prop = typeof callback === 'function' ? false : callback;
+      const buckets = {};
+      const prop = typeof callback === 'function' ? false : callback;
 
       function add(key, obj) {
         if (!buckets[key]) buckets[key] = [];
@@ -67,14 +67,14 @@ export default function (_) {
       }
 
       _.each(collection, function (obj) {
-        var keys = prop === false ? callback(obj) : obj[prop];
+        const keys = prop === false ? callback(obj) : obj[prop];
 
         if (!_.isArray(keys)) {
           add(keys, obj);
           return;
         }
 
-        var length = keys.length;
+        let length = keys.length;
         while (length-- > 0) {
           add(keys[length], obj);
         }
@@ -108,14 +108,14 @@ export default function (_) {
      * @return {Array} dest
      */
     pushAll: function (source, dest) {
-      var start = dest.length;
-      var adding = source.length;
+      const start = dest.length;
+      const adding = source.length;
 
       // allocate - http://goo.gl/e2i0S0
       dest.length = start + adding;
 
       // fill sparse positions
-      var i = -1;
+      let i = -1;
       while (++i < adding) dest[start + i] = source[i];
 
       return dest;
diff --git a/src/ui/public/utils/lodash-mixins/function.js b/src/ui/public/utils/lodash-mixins/function.js
index c458a71b62d5..1d3c022ad6cf 100644
--- a/src/ui/public/utils/lodash-mixins/function.js
+++ b/src/ui/public/utils/lodash-mixins/function.js
@@ -13,11 +13,11 @@ export default function (_) {
      * @return {Function} - the wrapper method
      */
     onceWithCb: function (fn) {
-      var callbacks = [];
+      const callbacks = [];
 
       // on initial flush, call the init function, but ensure
       // that it only happens once
-      var flush = _.once(function (cntx, args) {
+      let flush = _.once(function (cntx, args) {
         args.push(function finishedOnce() {
           // override flush to simply schedule an asynchronous clear
           flush = function () {
@@ -33,8 +33,8 @@ export default function (_) {
       });
 
       return function runOnceWithCb() {
-        var args = [].slice.call(arguments, 0);
-        var cb = args[args.length - 1];
+        let args = [].slice.call(arguments, 0);
+        const cb = args[args.length - 1];
 
         if (typeof cb === 'function') {
           callbacks.push(cb);
diff --git a/src/ui/public/utils/lodash-mixins/object.js b/src/ui/public/utils/lodash-mixins/object.js
index 32b4a528d3c4..334e1b5d8af4 100644
--- a/src/ui/public/utils/lodash-mixins/object.js
+++ b/src/ui/public/utils/lodash-mixins/object.js
@@ -18,8 +18,8 @@ export default function (_) {
      * @return {object}
      */
     flattenWith: function (dot, nestedObj, flattenArrays) {
-      var stack = []; // track key stack
-      var flatObj = {};
+      const stack = []; // track key stack
+      const flatObj = {};
 
       (function flattenObj(obj) {
         _.keys(obj).forEach(function (key) {
diff --git a/src/ui/public/utils/lodash-mixins/oop.js b/src/ui/public/utils/lodash-mixins/oop.js
index 39c329dce81f..b8a148f28004 100644
--- a/src/ui/public/utils/lodash-mixins/oop.js
+++ b/src/ui/public/utils/lodash-mixins/oop.js
@@ -11,10 +11,10 @@ export default function (_) {
     };
   }
 
-  var props = {
+  const props = {
     inherits: describeConst(function (SuperClass) {
 
-      var prototype = Object.create(SuperClass.prototype, {
+      const prototype = Object.create(SuperClass.prototype, {
         constructor: describeConst(this),
         superConstructor: describeConst(SuperClass)
       });
diff --git a/src/ui/public/utils/lodash-mixins/string.js b/src/ui/public/utils/lodash-mixins/string.js
index 4c9208c2322b..a4ab8bfdb91e 100644
--- a/src/ui/public/utils/lodash-mixins/string.js
+++ b/src/ui/public/utils/lodash-mixins/string.js
@@ -1,6 +1,6 @@
 export default function (_) {
 
-  var DOT_PREFIX_RE = /(.).+?\./g;
+  const DOT_PREFIX_RE = /(.).+?\./g;
 
   _.mixin({
 
@@ -39,10 +39,10 @@ export default function (_) {
     commaSeperatedList: function (input) {
       if (_.isArray(input)) return input;
 
-      var source = String(input || '').split(',');
-      var list = [];
+      const source = String(input || '').split(',');
+      const list = [];
       while (source.length) {
-        var item = source.shift().trim();
+        const item = source.shift().trim();
         if (item) list.push(item);
       }