Good for the information it does present but both pros and cons are primarily focused on ElasticSearch. Which is fine because the author did a very good job trying to present both the pros and cons on ElasticSearch.
It would be a better (read different) presentation if it walked through the pros and cons with ElasticSearch and Apache Solr side by side. (But an author is entitled to write the post they want, not the one desired by others.)
I don’t know if it would be worth the effort but a common interface that searched the JIRA (or other issue tracking mechanisms) for common search engines and presented issues grouped together, that could be quite useful.
For comparison purposes but also for cross-pollination of solutions.