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    <p>Please follow <a href="http://lucene.apache.org/core/4_1_0/MIGRATE.html" rel="nofollow">Lucene 4 Migration guide</a>::</p> <blockquote> <p>How you obtain the enums has changed. The primary entry point is the <code>Fields</code> class. If you know your reader is a single segment reader, do this: </p> <pre><code>Fields fields = reader.Fields(); if (fields != null) { ... } </code></pre> <p>If the reader might be multi-segment, you must do this: </p> <pre><code>Fields fields = MultiFields.getFields(reader); if (fields != null) { ... } </code></pre> <p>The <code>fields</code> may be <code>null</code> (eg if the reader has no fields).</p> <p>Note that the <code>MultiFields</code> approach entails a performance hit on <code>MultiReaders</code>, as it must merge terms/docs/positions on the fly. It's generally better to instead get the sequential readers (use <code>oal.util.ReaderUtil</code>) and then step through those readers yourself, if you can (this is how Lucene drives searches).</p> <p>If you pass a <code>SegmentReader</code> to <code>MultiFields.fields</code> it will simply return <code>reader.fields()</code>, so there is no performance hit in that case.</p> <p>Once you have a non-null Fields you can do this: </p> <pre><code>Terms terms = fields.terms("field"); if (terms != null) { ... } </code></pre> <p>The <code>terms</code> may be <code>null</code> (eg if the field does not exist).</p> <p>Once you have a non-<code>null</code> terms you can get an enum like this: </p> <pre><code>TermsEnum termsEnum = terms.iterator(); </code></pre> <p>The returned <code>TermsEnum</code> will not be null.</p> <p>You can then <code>.next()</code> through the <code>TermsEnum</code></p> </blockquote>
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    1. POHow to get all terms for a Lucene field in Lucene 4
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    1. COGreat to mention the migration guide, but I think your answer would be a lot more useful if you could post here the part that is relevant to the question and what you suggest to do.
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    2. COI just added the relevant part to my question above.
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    3. COhmm, my bad, i will take that into account from now on..
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