SOLR

File : schema.xml (OR schema_extra_types.xml):

I have created this file

web/modules/contrib/search_api_solr/src/Plugin/search_api/data_type/MyCustomTextDataType.php:

It works (if in synonyms_index.txt): 

usa => united states of america

It does NOT work (if in synonyms_query.txt): 

usa => united states of america

My config file (schema_extra_types.xml):

Problem:

Example: SnowBalld converts "sichern" to "sich".

List/content of stopwords_de.txt:

Search-keywords are not more than 64 char.

Error:

Solution:

 # java --version && /opt/solr/bin/solr --version

Output:

Problem:

Uninstall / remove Apache Solr 9.x completely

Solution:

service solr stop  && rm -rfv /var/solr && rm -v /etc/init.d/solr  && rm -rfv /opt/solr  && rm -rfv /opt/solr-9* && rm -rfv /etc/default/solr.in.sh

additionally (if needed): 

Problem:

...
Service solr installed.
Customize Solr startup configuration in /etc/default/solr.in.sh
Job for solr.service failed because the control process exited with error code.
See "systemctl status solr.service" and "journalctl -xeu solr.service" for details.

Problem:

Failed to start solr.service - LSB: Controls Apache Solr as a Service.

More details:

Problem, when I call http://127.0.0.1:8983/solr/:

Searching for Solr?
You must type the correct path.
Solr will respond. 

Solution?