LUCENE-4995: Don't hold references on large decompression buffers in CompressingStoredFieldsReader. CompressingStoredFieldsReader now only reuses an internal buffer when there is no more than 32kb to decompress. For large blocks, a dedicated decompression buffer will be created on demand.
lucene/dev/trunk/lucene/core/src/java/org/apache/lucene/codecs/compressing/CompressingStoredFieldsReader.java