Upgrade from 4.1 - 4.5 - Indexer crashing - [FDB ERR] Failed to read the superblock:

Service 'indexer' exited with status 1. Restarting. Messages: runtime.goexit()

	/home/couchbase/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/asm_amd64.s:1998 +0x1 fp=0xc820043fb0 sp=0xc820043fa8

created by net/http.(*Transport).dialConn

	/home/couchbase/.cbdepscache/exploded/x86_64/go-1.6/go/src/net/http/transport.go:854 +0x10cb

[goport] 2016/05/24 03:14:23 /opt/couchbase/bin/indexer terminated: signal: aborted (core dumped)

2016-05-24T03:05:24.742-07:00 [Error] updateIndexerList(): Cannot locate cluster node.

[FDB INFO] Forestdb blockcache size 268435456 initialized in 15508 us

[FDB ERR] Failed to read the superblock: incorrect block marker (marker: dd, SB No.: 0)

[FDB ERR] Failed to read the superblock: incorrect block marker (marker: ee, SB No.: 1)

[FDB ERR] Failed to read the superblock: incorrect block marker (marker: dd, SB No.: 2)

[FDB ERR] Failed to read the superblock: incorrect block marker (marker: ee, SB No.: 3)

[FDB INFO] Forestdb opened database file /opt/couchbase/var/lib/couchbase/data/@2i/MetadataStore

[FDB ERR] Cannot open KV store instance 'MAIN' because multi-KV store instance mode is disabled.

[FDB INFO] Forestdb closed database file /opt/couchbase/var/lib/couchbase/data/@2i/MetadataStore

2016-05-24T03:05:24.778-07:00 [Error] EmbeddedServer.boostrap: error : FDB_RESULT_INVALID_CONFIG

panic: close of nil channel

goroutine 1 [running]:

panic(0xced3c0, 0xc8231a0a00)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/panic.go:464 +0x3e6 fp=0xc82013ccb8 sp=0xc82013cc38

runtime.closechan(0x0)

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/chan.go:294 +0x75 fp=0xc82013cd08 sp=0xc82013ccb8

github.com/couchbase/indexing/secondary/manager.(*IndexManager).Close(0xc8200e62c0)

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/manager/manager.go:271 +0x143 fp=0xc82013cd30 sp=0xc82013cd08

github.com/couchbase/indexing/secondary/manager.NewIndexManagerInternal(0x7f24e6c956a0, 0xc821187c80, 0x7f24e6c95740, 0xc823208120, 0xc8200183f0, 0xc8200e62c0, 0x7f24e6c957e0, 0xc8231a09d0)

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/manager/manager.go:185 +0xcec fp=0xc82013d070 sp=0xc82013cd30

github.com/couchbase/indexing/secondary/manager.NewIndexManager(0x7f24e6c956a0, 0xc821187c80, 0xc8200183f0, 0x7f24e6c956a0, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/manager/manager.go:122 +0x222 fp=0xc82013d148 sp=0xc82013d070

github.com/couchbase/indexing/secondary/indexer.NewClustMgrAgent(0xc8211a23c0, 0xc8211a2000, 0xc8200183f0, 0x0, 0x0, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/cluster_manager_agent.go:71 +0x7e1 fp=0xc82013d2f8 sp=0xc82013d148

github.com/couchbase/indexing/secondary/indexer.NewIndexer(0xc8201522d0, 0x0, 0x0, 0x0, 0x0)

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/indexer/indexer.go:240 +0x20d1 fp=0xc82013dc20 sp=0xc82013d2f8

main.main()

        /home/couchbase/jenkins/workspace/watson-unix/goproj/src/github.com/couchbase/indexing/secondary/cmd/indexer/main.go:153 +0x15b5 fp=0xc82013df40 sp=0xc82013dc20

runtime.main()

        /home/couchbase/.cbdepscache/exploded/x86_64/go-1.6/go/src/runtime/proc.go:188 +0x2b0 fp=0xc82013df90 sp=0xc82013df40

runtime.goexit()