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Sorry to hear you’re facing problems 
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version: 20.5.0
Operating system and version: Debian 10
Apache or nginx version: neweset jwilder nginx
PHP version (eg, 7.4): docker nextcloud
The issue you are facing:
Is this the first time you’ve seen this error? (Y):
Steps to replicate it:
- Migrate files to new Server
- Import data, database and config into nextcloud docker
- try filesearch
The output of your Nextcloud log in Admin > Logging:
[no app in context] Error: OCP\Files\NotFoundException: Node for share not found, fileid: 131165 at <<closure>>
0. /var/www/html/lib/private/Share20/Share.php line 236
OC\Share20\Share->getNode()
1. /var/www/html/apps/files_sharing/lib/SharedStorage.php line 367
OC\Share20\Share->getNodeType()
2. <<closure>>
OCA\Files_Sharing\SharedStorage->getItemType()
3. /var/www/html/lib/private/Files/Storage/Wrapper/Wrapper.php line 507
call_user_func_array([OCA\Files_Shari ... "], [])
4. /var/www/html/apps/files_sharing/lib/Cache.php line 183
OC\Files\Storage\Wrapper\Wrapper->__call("getItemType", [])
5. <<closure>>
OCA\Files_Sharing\Cache->search("%why do%")
6. /var/www/html/lib/private/Files/View.php line 1667
call_user_func_array([OCA\Files_Sharing\Cache {},"search"], ["%why do%"])
7. /var/www/html/lib/private/Files/View.php line 1599
OC\Files\View->searchCommon("search", ["%why do%"])
8. /var/www/html/lib/private/Files/Filesystem.php line 763
OC\Files\View->search("why do")
9. /var/www/html/lib/private/Search/Provider/File.php line 47
OC\Files\Filesystem::search("why do")
10. /var/www/html/apps/files/lib/Search/FilesSearchProvider.php line 120
OC\Search\Provider\File->search("why do")
11. /var/www/html/lib/private/Search/SearchComposer.php line 162
OCA\Files\Search\FilesSearchProvider->search(OC\User\User {}, OC\Search\SearchQuery {})
12. /var/www/html/core/Controller/UnifiedSearchController.php line 110
OC\Search\SearchComposer->search(OC\User\User {}, "files", OC\Search\SearchQuery {})
13. /var/www/html/lib/private/AppFramework/Http/Dispatcher.php line 169
OC\Core\Controller\UnifiedSearchController->search("files", "why do", null, null, null, "/apps/files/?dir=/&fileid=6")
14. /var/www/html/lib/private/AppFramework/Http/Dispatcher.php line 100
OC\AppFramework\Http\Dispatcher->executeController(OC\Core\Controll ... {}, "search")
15. /var/www/html/lib/private/AppFramework/App.php line 152
OC\AppFramework\Http\Dispatcher->dispatch(OC\Core\Controll ... {}, "search")
16. /var/www/html/lib/private/Route/Router.php line 309
OC\AppFramework\App::main("OC\\Core\\Contr ... r", "search", OC\AppFramework\ ... {}, {providerId: "fi ... "})
17. /var/www/html/ocs/v1.php line 88
OC\Route\Router->match("/ocsapp/search/providers/files/search")
18. /var/www/html/ocs/v2.php line 24
require_once("/var/www/html/ocs/v1.php")
GET /ocs/v2.php/search/providers/files/search?term=why+do&from=%2Fapps%2Ffiles%2F%3Fdir%3D%2F%26fileid%3D6
from 212.102.35.98 by der_spotter at 2021-02-25T00:01:21+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => ---',
'passwordsalt' => '---',
'secret' => '---',
'trusted_domains' =>
array (
0 => '---',
1 => '---',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '20.0.5.2',
'overwrite.cli.url' => '---',
'htaccess.RewriteBase' => '/',
'dbname' => 'nextcloud',
'dbhost' => 'nc_db',
'dbport' => '3306',
'dbtableprefix' => 'oc_',
'dbuser' => '---',
'dbpassword' => ---',
'installed' => true,
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'mysql.utf8mb4' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'updater.release.channel' => 'stable',
'mail_smtpmode' => 'smtp',
'mail_smtphost' => '---',
'mail_sendmailmode' => 'smtp',
'mail_smtpport' => '587',
'mail_from_address' => '--',
'mail_domain' => '---',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpname' => '---',
'mail_smtppassword' => '---',
'mail_smtpsecure' => 'tls',
'app_install_overwrite' =>
array (
0 => 'discoursesso',
),
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'redis',
'password' => '',
'port' => 6379,
),
);
The output of your Apache/nginx/system log in /var/log/____:
n/a
Please help me. I can’t understand why the filesearch doesn’t work anymore. Emailsearch, search in Deck and Discourse works fine. When I update to 21 Deck also isn’t searchable anymore. I still have the same instance running outside docker on another Debian 9 server with exactly the same data, database and config and everything works fine!