How to use analyzers in Lucene Index

[Suhas]

I have a class whose field "title" needs to be pre-tokenized by an underscore instead of space. For example: "title": "Foo_of_Bar_FooBar" into ["Foo", "of", "Bar", "FooBar"]

I used the following to create a full-text index.

CREATE INDEX CLASS.title_lucene ON CLASS(title)
            FULLTEXT ENGINE LUCENE METADATA {
                "analyzer": "org.apache.lucene.analysis.pattern.PatternReplaceCharFilter",
                "analyzer_pattern": "_",
                "analyzer_replacement": " ",
                "index": "org.apache.lucene.analysis.standard.StandardAnalyzer"
            }

I tried using "pattern" and "replacement" instead of "analyzer_pattern" and "analyzer_replacement". None of them worked. 

How do I pass the arguments to the constructor of the class specified?

The aforementioned class is located here.