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With Lucene, is it possible to do a straight term lookup without having to iterate over the terms?
For ex:
IndexReader r = IndexReader.open("...");
Term t = r.getTerm("myterm");
I think you need to first read a basic lucene tutorial such as this. Note that the code used in the tutorial is old, i.e., does not correspond to the latest lucene version. From your comment to Mike, I believe are looking for “search”.
An alternative is to use a wrapper over lucene such as Elasticsearch that provides a simple interface. Nevertheless, it is important to understand the interface before using it.