assertion when running compaction on a sherlock fdb file

1) Generate a forestdb index file from a sherlock build
2) Copy the sherlock forestdb file to watson (under ns_server/data/n_0/data through cluster_run)
3) Bring up the watson server
4) Indexer is able to read the sherlock fdb file (see file format as ForestDB v1.x format)
5) hen indexer tries to compact the file, I run into a fdb assertion as follow (see below).

2016-03-10T17:18:00.574-08:00 [Info] Indexer::initPartnInstance Initialized Partition:
Index: 3596062478303614404 Partition: PartitionId: 0 Endpoints: [:9105]
2016-03-10T17:18:00.575-08:00 [Info] NewForestDBSlice(): file version ForestDB v1.x format
2016-03-10T17:18:00.576-08:00 [Info] ForestDBSlice:NewForestDBSlice Created New Slice Id 0 IndexInstId 3596062478303614404 WriterThreads 1
2016-03-10T17:18:00.576-08:00 [Info] Indexer::initPartnInstance Initialized Slice:
Index: 3596062478303614404 Slice: SliceId: 0 File: /users/jliang/documents/eclipse/watson/watson/ns_server/data/n_0/data/@2i/default_company_3596062478303614404_0.index Index: 3596062478303614404
2016-03-10T17:18:00.577-08:00 [Info] Indexer: Storage Mode Set As forestdb
...
2016-03-10T17:18:01.625-08:00 [Warn] Compacting index due to upgrade
2016-03-10T17:18:01.636-08:00 [Info] ForestDBSlice::Compact Compacting upto SeqNum 119471. Slice Id 0, IndexInstId 3596062478303614404, IndexDefnId 3596062478303614404
Assertion failed: (aa), function fdb_kvs_header_copy, file /Users/jliang/Documents/eclipse/watson/watson/forestdb/src/kv_instance.cc, line 662.
SIGABRT: abort
PC=0x7fff8bf13866 m=13
signal arrived during cgo execution

goroutine 105 [syscall, locked to thread]:
runtime.cgocall(0x48532c0, 0xc823653b60, 0x0)
/Users/jliang/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/cgocall.go:123 +0x11b fp=0xc823653b10 sp=0xc823653ae0
github.com/couchbase/indexing/secondary/fdb._Cfunc_fdb_compact_upto(0x1801a030, 0x18015500, 0x2b47, 0x0)
??:0 +0x41 fp=0xc823653b60 sp=0xc823653b10
github.com/couchbase/indexing/secondary/fdb.(*File).CompactUpto(0xc82325bc80, 0xc8201ccb80, 0x80, 0xc8232255f8, 0x0, 0x0)
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/fdb/file.go:113 +0x32d fp=0xc823653bf0 sp=0xc823653b60
github.com/couchbase/indexing/secondary/indexer.(*fdbSlice).Compact(0xc820202280, 0x0, 0x0)
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/indexer/forestdb_slice_writer.go:1265 +0x107b fp=0xc823653ee0 sp=0xc823653bf0
github.com/couchbase/indexing/secondary/indexer.(*storageMgr).handleIndexCompaction.func1(0xc823327f60, 0x1, 0x1, 0xc8232dca80)
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/indexer/storage_manager.go:848 +0x9a fp=0xc823653f70 sp=0xc823653ee0
runtime.goexit()
/Users/jliang/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc823653f78 sp=0xc823653f70
created by github.com/couchbase/indexing/secondary/indexer.(*storageMgr).handleIndexCompaction
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/indexer/storage_manager.go:857 +0x485

goroutine 1 [select]:
github.com/couchbase/indexing/secondary/indexer.(*indexer).run(0xc8201b58c0)
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:444 +0x292
github.com/couchbase/indexing/secondary/indexer.NewIndexer(0xc820140a50, 0x0, 0x0, 0x0, 0x0)
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:330 +0x393f
main.main()
/Users/jliang/Documents/eclipse/watson/watson/goproj/src/github.com/couchbase/indexing/secondary/cmd/indexer/main.go:100 +0x1374