Terms containing parenthesis have no occurrence while being present in documents
Summary
When having a term that contains parenthesis, occurrence is at 0 when it is present in multiple documents.
Steps to reproduce
Create a corpus with at least one document containing parenthesis.
What is the current bug behavior?
Occurrence is at 0 but term is present in documents.
What is the expected correct behavior?
Occurrence should be incremented each time a document contains the term.
Relevant logs and/or screenshots
