Concurrent attempts to create indexes trigger SG restart

2019-12-06T15:11:05.136-08:00 [WRN] Error when querying index using statement: [SELECT meta(`bucket-1`).xattrs._sync.access.foo as val FROM `bucket-1` WHERE ANY op in OBJECT_PAIRS(meta(`bucket-1`).xattrs._sync.access) SATISFIES op.name = 'foo' end LIMIT 1] parameters: [<nil>] error:[5000] Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

 - cause: Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

 -- base.(*CouchbaseBucketGoCB).Query() at bucket_n1ql.go:76

2019-12-06T15:11:05.136-08:00 [WRN] Query error for statement [SELECT meta(`$_bucket`).xattrs._sync.access.foo as val FROM `$_bucket` WHERE ANY op in OBJECT_PAIRS(meta(`$_bucket`).xattrs._sync.access) SATISFIES op.name = 'foo' end LIMIT 1], err:[5000] Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

 - cause: Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

 -- db.waitForIndexes.func1() at indexes.go:335

2019-12-06T15:11:05.145-08:00 [ERR] Error opening database db: [5000] Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

 - cause: Index sg_access_x1 will retry building in the background for reason: Build Already In Progress. Bucket bucket-1.

github.com/couchbase/sync_gateway/base.(*CouchbaseBucketGoCB).Query

        /home/couchbase/jenkins/workspace/sgw-toy-build/2.7.0/enterprise/godeps/src/github.com/couchbase/sync_gateway/base/bucket_n1ql.go:77

github.com/couchbase/sync_gateway/db.waitForIndex

        /home/couchbase/jenkins/workspace/sgw-toy-build/2.7.0/enterprise/godeps/src/github.com/couchbase/sync_gateway/db/indexes.go:358

github.com/couchbase/sync_gateway/db.waitForIndexes.func1

        /home/couchbase/jenkins/workspace/sgw-toy-build/2.7.0/enterprise/godeps/src/github.com/couchbase/sync_gateway/db/indexes.go:333

runtime.goexit

        /usr/local/go/1.13.4/go/src/runtime/asm_amd64.s:1357 -- rest.RunServer() at config.go:1028