Its an amazing combo of applications, completely free of cost with easy implementation and powerful online support.
It served the best in driving the product to it's success with it's great capability and accuracy of indexing data.
The product is very popular among many companies, therefore there is a big community who can share their knowledge, the search is very fast and the installation process and integration are very easy.
Can suffer from 5 V problems that are Velocity, Veracity, Value, Volume and Variety. Query is less flexible than SQL query.
Syntax could really mess the intentions up. There is a difference between 'filter' and 'filters', 'term' and 'terms' filters and that's the beginning.
Mostly for developers, other people's would have a hard time to understand and work on it. Also the query is typical or hard to write in terms of SQL queries.