public void setExact(boolean exact, String terminator) {
        this.exact = exact;
        this.exactTerminator = terminator;
    }
Set whether this index should match any kind of characters

@param exact true to make this index match any kind of characters, not just word and digit ones
@param terminator the terminator of an exact sequence (one or more characters),
       or null to use the default (space)
container-search/src/main/java/com/yahoo/prelude/Index.java