diff --git a/.gitattributes b/.gitattributes
index 92411d5..ba5fafc 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -10,6 +10,8 @@
 /.eslintrc.json export-ignore
 /.gitattributes export-ignore
 /.gitignore export-ignore
+/.husky export-ignore
+/.lintstagedrc.json export-ignore
 /.npmrc export-ignore
 /.nvmrc export-ignore
 /.stylelintignore export-ignore
diff --git a/.gitignore b/.gitignore
index 18d344d..b4f7c85 100755
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@ release
 vendor
 .idea
 *.log
+.phpunit.result.cache
 
 # Editors
 *.esproj
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6587fe0..f408f21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,35 @@ All notable changes to this project will be documented in this file, per [the Ke
 
 ## [Unreleased]
 
+<!--
+### Added
+### Changed
+### Deprecated
+### Removed
+### Fixed
+### Security
+-->
+
+## [2.1.0] - 2023-03-XX
+
+### Added
+- Compatibility with the [WooCommerce Subscriptions](https://woocommerce.com/products/woocommerce-subscriptions/) add-on. Props [@ecaron](https://github.com/ecaron) and [@felipeelia](https://github.com/felipeelia) via [#51](https://github.com/10up/ElasticPressLabs/pull/51).
+- Users Feature (migrated from the main ElasticPress plugin). Props [@felipeelia](https://github.com/felipeelia), [@MARQAS](https://github.com/MARQAS), and [@burhandodhy](https://github.com/burhandodhy) via [#50](https://github.com/10up/ElasticPressLabs/pull/50) and [#59](https://github.com/10up/ElasticPressLabs/pull/50).
+- Load PHP classes via `spl_autoload_register()`. Props [@burhandodhy](https://github.com/burhandodhy) via [#57](https://github.com/10up/ElasticPressLabs/pull/57).
+
+## Changed
+- Code standards are now applied to the test suite too. Props [@felipeelia](https://github.com/felipeelia) via [#54](https://github.com/10up/ElasticPressLabs/pull/54).
+- Hide subfeatures if the required plugins are not activated. Props [@burhandodhy](https://github.com/burhandodhy) via [#56](https://github.com/10up/ElasticPressLabs/pull/56).
+
+### Fixed
+- Adjusted the method used to determine if classes are loaded. Props [@ecaron](https://github.com/ecaron) via [#51](https://github.com/10up/ElasticPressLabs/pull/51).
+- Ensure feature classes are only loaded once. Props [@ecaron](https://github.com/ecaron) via [#43](https://github.com/10up/ElasticPressLabs/pull/43).
+- PHP Lint on PHP 8. Props [@felipeelia](https://github.com/felipeelia) via [#49](https://github.com/10up/ElasticPressLabs/pull/49).
+
+### Security
+- Bumped `loader-utils` from 2.0.2 to 2.0.4. Props [@dependabot](https://github.com/dependabot) via [#46](https://github.com/10up/ElasticPressLabs/pull/46).
+- Bumped `json5` from 1.0.1 to 1.0.2. Props [@dependabot](https://github.com/dependabot) via [#47](https://github.com/10up/ElasticPressLabs/pull/46).
+
 ## [2.0.0] - 2022-10-17
 
 ### Added
@@ -41,6 +70,7 @@ All notable changes to this project will be documented in this file, per [the Ke
 - Initial plugin release.
 
 [Unreleased]: https://github.com/10up/ElasticPressLabs/compare/trunk...develop
+[2.1.0]: https://github.com/10up/ElasticPressLabs/compare/2.0.0...2.1.0
 [2.0.0]: https://github.com/10up/ElasticPressLabs/compare/1.2.0...2.0.0
 [1.2.0]: https://github.com/10up/ElasticPressLabs/compare/1.1.0...1.2.0
 [1.1.0]: https://github.com/10up/ElasticPressLabs/compare/1.0.0...1.1.0
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index e11709d..54dab28 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -24,7 +24,7 @@ For more on how 10up writes and manages code, check out our [10up Engineering Be
 
 ## Workflow
 
-The `develop` branch is the development branch which means it contains the next version to be released.  `trunk` contains the corresponding stable development version.  Always work on the `develop` branch and open up PRs against `develop`.
+The `develop` branch is the development branch which means it contains the next version to be released. `trunk` contains the corresponding stable development version. Always work on the `develop` branch and open up PRs against `develop`.
 
 ## Release instructions
 
@@ -32,14 +32,14 @@ The `develop` branch is the development branch which means it contains the next
 1. Version bump: Bump the version number in `elasticpresslabs.php`, `/languages/ElasticPressLabs.pot`, `package-lock.json`, `package.json`, `readme.txt`, and any other relevant files if it does not already reflect the version being released.  In `elasticpresslabs.php` update both the plugin "Version:" property and the plugin `ELASTICPRESS_LABS_VERSION` constant.
 1. Changelog: Add/update the changelog in `CHANGELOG.md` and `readme.txt`, ensuring to link the [X.Y.Z] release reference in the footer of `CHANGELOG.md` (e.g., https://github.com/10up/ElasticPressLabs/compare/X.Y.Z-1...X.Y.Z).
 1. Props: Update `CREDITS.md` file with any new contributors, confirm maintainers are accurate.
-1. Readme updates: Make any other readme changes as necessary.  `README.md` is geared toward GitHub and `readme.txt` contains WordPress.org-specific content.  The two are slightly different.
+1. Readme updates: Make any other readme changes as necessary. `README.md` is geared toward GitHub and `readme.txt` contains WordPress.org-specific content. The two are slightly different.
 1. New files: Check to be sure any new files/paths that are unnecessary in the production version are included in `.gitattributes`.
-1. Merge: Merge the release branch/PR into `develop`, then make a non-fast-forward merge from `develop` into `trunk` (`git checkout trunk && git merge --no-ff develop`).  `trunk` contains the stable development version.
+1. POT file: Run `wp i18n make-pot . languages/ElasticPressLabs.pot` and commit the file. In case of errors, try to disable Xdebug (see [#3079](https://github.com/10up/ElasticPress/pull/3079#issuecomment-1291028290).)
+1. Release date: Double check the release date in both changelog files.
+1. Merge: Merge the release branch/PR into `develop`, then make a non-fast-forward merge from `develop` into `trunk` (`git checkout trunk && git merge --no-ff develop`). `trunk` contains the stable development version.
 1. Test: While still on the `trunk` branch, test for functionality locally.
 1. Push: Push your `trunk` branch to GitHub (e.g. `git push origin trunk`).
 1. Release: Create a [new release](https://github.com/10up/elasticpresslabs/releases/new), naming the tag and the release with the new version number, and targeting the `trunk` branch.  Paste the release changelog from `CHANGELOG.md` into the body of the release and include a link to the closed issues on the [milestone](https://github.com/10up/elasticpresslabs/milestone/#?closed=1).
-1. SVN: Wait for the [GitHub Action](https://github.com/10up/ElasticPresslabs/actions) to finish deploying to the WordPress.org repository.  If all goes well, users with SVN commit access for that plugin will receive an emailed diff of changes.
-1. Check WordPress.org: Ensure that the changes are live on https://wordpress.org/plugins/elasticpresslabs/.  This may take a few minutes.
 1. Close milestone: Edit the [milestone](https://github.com/10up/elasticpresslabs/milestone/#) with release date (in the `Due date (optional)` field) and link to GitHub release (in the `Description` field), then close the milestone.
 1. Punt incomplete items: If any open issues or PRs which were milestoned for `X.Y.Z` do not make it into the release, update their milestone to `X.Y.Z+1`, `X.Y+1.0`, `X+1.0.0` or `Future Release`.
 
@@ -53,12 +53,12 @@ There may be cases where we have an urgent/important fix that ideally gets into
 1. Props: Update `CREDITS.md` file with any new contributors, confirm maintainers are accurate.
 1. Readme updates: Make any other readme changes as necessary.  `README.md` is geared toward GitHub and `readme.txt` contains WordPress.org-specific content.  The two are slightly different.
 1. New files: Check to be sure any new files/paths that are unnecessary in the production version are included in `.gitattributes`.
+1. POT file: Run `wp i18n make-pot . lang/elasticpress.pot` and commit the file.
+1. Release date: Double check the release date in both changelog files.
 1. Merge: Merge the release branch/PR into `trunk`.  `trunk` contains the stable development version.
 1. Test: While still on the `trunk` branch, test for functionality locally.
 1. Push: Push your `trunk` branch to GitHub (e.g. `git push origin trunk`).
 1. Release: Create a [new release](https://github.com/10up/elasticpresslabs/releases/new), naming the tag and the release with the new version number, and targeting the `trunk` branch.  Paste the release changelog from `CHANGELOG.md` into the body of the release and include a link to the closed issues on the [milestone](https://github.com/10up/elasticpresslabs/milestone/#?closed=1).
-1. SVN: Wait for the [GitHub Action](https://github.com/10up/ElasticPressLabs/actions) to finish deploying to the WordPress.org repository.  If all goes well, users with SVN commit access for that plugin will receive an emailed diff of changes.
-1. Check WordPress.org: Ensure that the changes are live on https://wordpress.org/plugins/elasticpresslabs/.  This may take a few minutes.
 1. Close milestone: Edit the [milestone](https://github.com/10up/elasticpresslabs/milestone/#) with release date (in the `Due date (optional)` field) and link to GitHub release (in the `Description` field), then close the milestone.
 1. Punt incomplete items: If any open issues or PRs which were milestoned for `X.Y.Z` do not make it into the hotfix release, update their milestone to `X.Y.Z+1`, `X.Y+1.0`, `X+1.0.0` or `Future Release`.
 1. Apply hotfix changes to `develop`: Make a non-fast-forward merge from `trunk` into `develop` (`git checkout develop && git merge --no-ff trunk`) to ensure your hotfix change(s) are in sync with active development.
\ No newline at end of file
diff --git a/CREDITS.md b/CREDITS.md
index 8013075..210e8f1 100644
--- a/CREDITS.md
+++ b/CREDITS.md
@@ -20,6 +20,7 @@ Thank you to all the people who have already contributed to this repository via
 [Oscar Sanchez S. (@oscarssanchez)](https://github.com/oscarssanchez),
 [Burhan Nasir (@burhandodhy)](https://github.com/burhandodhy),
 [Mohammed Razzaq (@MARQAS)](https://github.com/MARQAS),
+[Eric Caron (@ecaron)](https://github.com/ecaron),
 and
 [Felipe Elia (@felipeelia)](https://github.com/felipeelia).
 
diff --git a/elasticpresslabs.php b/elasticpresslabs.php
index 9d2166c..efd1f24 100644
--- a/elasticpresslabs.php
+++ b/elasticpresslabs.php
@@ -3,7 +3,7 @@
  * Plugin Name:       ElasticPress Labs
  * Plugin URI:        https://github.com/10up/ElasticPressLabs
  * Description:       A developer focused interface to commonly ElasticPress plugin issues.
- * Version:           2.0.0
+ * Version:           2.1.0
  * Requires at least: 5.6
  * Requires PHP:      7.0
  * Author:            10up
@@ -18,7 +18,7 @@
  */
 
 // Useful global constants.
-define( 'ELASTICPRESS_LABS_VERSION', '2.0.0' );
+define( 'ELASTICPRESS_LABS_VERSION', '2.1.0' );
 define( 'ELASTICPRESS_LABS_URL', plugin_dir_url( __FILE__ ) );
 define( 'ELASTICPRESS_LABS_PATH', plugin_dir_path( __FILE__ ) );
 define( 'ELASTICPRESS_LABS_INC', ELASTICPRESS_LABS_PATH . 'includes/' );
diff --git a/languages/ElasticPressLabs.pot b/languages/ElasticPressLabs.pot
index c5cf769..6911bc0 100644
--- a/languages/ElasticPressLabs.pot
+++ b/languages/ElasticPressLabs.pot
@@ -1,17 +1,17 @@
-# Copyright (C) 2022 10up
-# This file is distributed under the same license as the ElasticPress Labs plugin.
+# Copyright (C) 2023 10up
+# This file is distributed under the GPL v2 or later.
 msgid ""
 msgstr ""
-"Project-Id-Version: ElasticPress Labs 2.0.0\n"
-"Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/elasticpresslabs\n"
+"Project-Id-Version: ElasticPress Labs 2.1.0\n"
+"Report-Msgid-Bugs-To: https://wordpress.org/support/plugin/elasticpress-labs\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"POT-Creation-Date: 2022-10-17T14:03:31+00:00\n"
+"POT-Creation-Date: 2023-02-28T13:04:54+00:00\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
-"X-Generator: WP-CLI 2.4.0\n"
+"X-Generator: WP-CLI 2.7.1\n"
 "X-Domain: elasticpress-labs\n"
 
 #. Plugin Name of the plugin
@@ -165,14 +165,31 @@ msgid "Version"
 msgstr ""
 
 #: includes/classes/Feature/SearchAlgorithm.php:138
+#: includes/classes/Feature/WooCommerceSubscriptionSearch.php:141
 msgid "Changes in this feature will be reflected only on the next page reload or expiration of any front-end caches."
 msgstr ""
 
-#: includes/functions/core.php:217
+#: includes/classes/Feature/WooCommerceSubscriptionSearch.php:33
+msgid "WooCommerce Admin Subscription Search"
+msgstr ""
+
+#: includes/classes/Feature/WooCommerceSubscriptionSearch.php:45
+msgid "Have WooCommerce Subscription admin search use EP."
+msgstr ""
+
+#: includes/classes/Feature/WooCommerceSubscriptionSearch.php:54
+msgid "By default, WooCommerce Subscriptions does not use ElasticPress. This tells it to index and search those, just like ElasticPress does for orders."
+msgstr ""
+
+#: includes/classes/Feature/WooCommerceSubscriptionSearch.php:139
+msgid "This feature requires the WooCommerce and Protected Content features to be enabled."
+msgstr ""
+
+#: includes/functions/core.php:219
 msgid "ElasticPress Labs needs ElasticPress to work."
 msgstr ""
 
 #. translators: Min. EP version
-#: includes/functions/core.php:232
+#: includes/functions/core.php:234
 msgid "ElasticPress Labs needs at least ElasticPress %s to work properly."
 msgstr ""
diff --git a/package-lock.json b/package-lock.json
index b1f1276..3b5f094 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "elasticpress-labs",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "elasticpress-labs",
-      "version": "2.0.0",
+      "version": "2.1.0",
       "license": "GPL-2.0-or-later",
       "devDependencies": {
         "10up-toolkit": "^4.2.2",
diff --git a/package.json b/package.json
index abcabbf..8ae9265 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "elasticpress-labs",
-  "version": "2.0.0",
+  "version": "2.1.0",
   "description": "ElasticPress Labs",
   "author": {
     "name": "10up",
diff --git a/readme.txt b/readme.txt
index 2a9e4a6..2eaf255 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,7 +2,7 @@
 Contributors:      10up
 Tags:              Elasticsearch, ElasticPress, search, boolean, Co-Authors Plus
 Requires at least: 5.6
-Tested up to:      6.0
+Tested up to:      6.1
 Stable tag:        2.0.0
 Requires PHP:      7.0
 License:           GPLv2 or later
@@ -28,6 +28,30 @@ This plugin provides a simple interface to enable and disable features.
 
 == Changelog ==
 
+= 2.1.0 - 2023-03-XX =
+
+__Added:__
+
+* Compatibility with the [WooCommerce Subscriptions](https://woocommerce.com/products/woocommerce-subscriptions/) add-on. Props [@ecaron](https://github.com/ecaron) and [@felipeelia](https://github.com/felipeelia).
+* Users Feature (migrated from the main ElasticPress plugin). Props [@felipeelia](https://github.com/felipeelia), [@MARQAS](https://github.com/MARQAS), and [@burhandodhy](https://github.com/burhandodhy).
+* Load PHP classes via `spl_autoload_register()`. Props [@burhandodhy](https://github.com/burhandodhy).
+
+__Changed:__
+
+* Code standards are now applied to the test suite too. Props [@felipeelia](https://github.com/felipeelia).
+* Hide subfeatures if the required plugins are not activated. Props [@burhandodhy](https://github.com/burhandodhy).
+
+__Fixed:__
+
+* Adjusted the method used to determine if classes are loaded. Props [@ecaron](https://github.com/ecaron).
+* Ensure feature classes are only loaded once. Props [@ecaron](https://github.com/ecaron).
+* PHP Lint on PHP 8. Props [@felipeelia](https://github.com/felipeelia).
+
+__Security:__
+
+* Bumped `loader-utils` from 2.0.2 to 2.0.4. Props [@dependabot](https://github.com/dependabot).
+* Bumped `json5` from 1.0.1 to 1.0.2. Props [@dependabot](https://github.com/dependabot).
+
 = 2.0.0 - 2022-10-17 =
 
 __Added:__