Grouping

Lucene supports grouping clauses to form sub-queries.

Lucene supports using parentheses to group clauses to form sub-queries. This is useful for controlling the Boolean logic in a query.

Examples:

To search for records that contain either Beta1 or Beta2 and the number 7.1, use the following query:
```
(Beta1 OR Beta2) AND 7.1
```
To search for records with a Headline field that contains both the term Beta1 and the phrase Beta2 test, use the following query:
```
Headline:(+Beta1 +"Beta2 test")
```