Hervé Yvis

This lightweight plugin allow you to make sure that only posts are searched by the WordPress’s search function.
<h4>License</h4>
This program is provided under the MIT license.
Copyright (c) 2019 Hervé Yvis
Permission is hereby granted, free of charge, to any person obtaining a copy 
of this software and associated documentation files (the “Software”), to deal 
in the Software without restriction, including without limitation the rights 
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
copies of the Software, and to permit persons to whom the Software is 
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all 
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
SOFTWARE.

WP – Fix search function [search only posts]

Make sure that only posts are searched by the Wordpress's search function.

Automattic

Daniel Bachhuber

Gary Jones

Mohammad Jangda

Assign multiple bylines to posts, pages, and custom post types via a search-as-you-type input box. Co-authored posts appear on a co-author’s archive page and in their feed. Co-authors may edit the posts they are associated with, and co-authors who are contributors may only edit posts if they have not been published (as is core behavior).
Add writers as bylines without creating WordPress user accounts. Simply <a href="https://github.com/Automattic/Co-Authors-Plus/wiki/Creating-and-editing-guest-authors" rel="nofollow ugc">create a guest author profile</a> for the writer and assign the byline as you normally would.
On the frontend, use the <a href="https://github.com/Automattic/Co-Authors-Plus/wiki/Template-tags" rel="nofollow ugc">Co-Authors Plus template tags</a> or the <a href="https://github.com/Automattic/Co-Authors-Plus/wiki/Blocks" rel="nofollow ugc">block editor blocks</a> to list co-authors anywhere you’d normally list the author.
<h3>Documentation</h3>
<ul>
<li>Usage — themer and site-owner guides live on the <a href="https://github.com/Automattic/Co-Authors-Plus/wiki" rel="nofollow ugc">GitHub Wiki</a>: template tags, blocks, guest author management, and multisite.</li>
<li>Developer reference — lives in-repo under <a href="./docs/" rel="nofollow ugc"><code>docs/</code></a> (not bundled in the distribution ZIP):
<ul>
<li><a href="./docs/filters.md" rel="nofollow ugc">Filters and actions</a></li>
<li><a href="./docs/rest-api.md" rel="nofollow ugc">REST API</a></li>
<li><a href="./docs/upgrading-to-4.0.md" rel="nofollow ugc">Upgrading to 4.0</a></li>
</ul>
</li>
</ul>
Co-Authors Plus is an almost complete rewrite of the <a href="https://wordpress.org/plugins/co-authors/" rel="ugc">Co-Authors</a> plugin originally developed by Weston Ruter (2007). The original plugin was inspired by the ‘<a href="https://txfx.net/2005/08/16/new-plugin-multiple-authors/" rel="nofollow ugc">Multiple Authors</a>‘ plugin by Mark Jaquith (2005).

Co-Authors Plus

No support at all , also it doesn't work with wpml

No Support - Not compatible with WPML

Not working

Works!

I rarely ever give 1 star reviews, but developers who take over a plugin - making a breaking change that took a while to resolve - and then refuse to follow standard practice by providing a changelog (despite requests) for future updates, cannot be trusted.

Avoid at all costs.

Cannot trust developers

Assign multiple bylines to posts, pages, and custom post types with a search-as-you-type input box.

WP – Fix search function [search only posts] vs Co-Authors Plus