A simple WordPress sidebar widget for searching in blog`s domain by Google. 
Uses JavaScript.

WordPress Google Search

lonkoenig

firebrandllc

SearchCloak allows you to hide specific Posts and Pages from search results.
There are many reasons you may want to remove specific pages from search results:
<ul>
<li>Parent pages used to organize URLs or menus, but don’t contain actual content</li>
<li>Partial page “sections” assembled by plugins into more complete pages</li>
<li>Pay-per-click Landing Pages (You probably don’t want those showing up in search engines.)</li>
<li>Pages that present similar or duplicate content that might otherwise appear multiple times in search results</li>
</ul>
This plugin adds a “SearchCloak” option to the edit screen of Posts and Pages.
When running the Gutenberg editor, this option block will appear under the “Document” tab in the right-hand column.
The options are: 
show – Show this Page or Post in search results (default) 
cloak – Hide this Page or Post from search results 
children – Hide this Page and all its children from search results (not available on Posts since they don’t have children)
<h3>Features:</h3>
<ul>
<li>Cloaked pages are also marked as “noindex” for search engines</li>
<li>You can hide ALL the children of a given page</li>
<li>Compatible with most search plugins</li>
<li>Works with Google Custom Search</li>
<li>Admin search results DO include cloaked pages</li>
<li>Cleans up multiple “robots” meta tags in the head section (sometimes happens with multiple plugins or settings)</li>
<li>Cloaking can be enabled for custom post types in the dashboard</li>
</ul>

SearchCloak

Hides Pages & Posts from search results and search engine indexes.

WordPress Google Search vs SearchCloak