Indexer memory usage grows higher than the index data size and is never freed.

Indexer memory usage grows higher than the index data size(25GB indexer_rss vs 10GB index_data_size) and is never freed for the duration of the test.

graph of Indexer data size growth:
http://cbmonitor.sc.couchbase.com/reports/html/?snapshot=secondary_400-2097_977_build_incrindex#secondary_400-2097_977_build_incrindexsecondary_400-2097_977bucket-1index_data_size

graph of Indexer resident set size growth:
http://cbmonitor.sc.couchbase.com/media/secondary_400-2097_977_build_incrindexsecondary_400-2097_977172.23.100.16indexer_rss.png

logs can be found at
http://ci.sc.couchbase.com/job/secondary/156/