How to form / return filter (Query object)?

[Learner]

I was able to form a TermQuery as below,

Query query=new TermQuery(new Term("id","value"));

I am trying to form a filter query something that returns just the filter
that can be used with any query type (q or fq).

                if (qstr == null || qstr.trim().length() < 1) {
                        return new QParser(qstr, localParams, params, req) {
                                @Override
                                public Query parse() throws SyntaxError {
                                        *return null;*
                                }
                        };
                }

As of now I am returning null, instead I am trying return query object with
filter (ex: *:*). Can someone let me know how to implement that?





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