* issue 496.3: move more coordinator-related logic out of TRI_vocbase_t, rename some arangosearch view configuration parameters, remove some consolidation policies, update iresearch to revision 6fd9760d81b136f769e277ea5b8f53996ed7a1ca
* address potential deadlock between link creation and FlushThread
* remove code causing nullptr access
* add back lock around reader reopen
* revert: address potential deadlock between link creation and FlushThread
* invalidate payload for each field in FieldIterator before setting a value
* issue 496.1: switch scope of responsibility between a TRI_vocbase_t and a LogicalView in respect to view creation/deletion
* backport: address test failures
* backport: ensure arangosearch links get exported in the dump
* backport: ensure view is created during restore on the coordinator
* Updates for ArangoSearch DDL tests, IResearchView unregistration and known issues
* Add fix for internal issue 483
* start implementing arangosearch cluster tests.
* backport: ensure view lookup is done via collectionNameResover, ensure updateProperties returns current view properties
* first attempt to fix failing tests
* refactor cluster wide view creation logic
* if view is not found in the new plan then check the old plan too
* ensure the cluster-wide view is looked up in vocbase as well on startup/recovery
* do not store cluster-wide IResearchView in vocbase
* move stale view cleanup to the shared pointer deleter, address test failures
* do not print warning
* enable arangosearch tests by default
* fix catch tests
* address icorrect return value for cluster-wide links
* address some issues with test failures due to cluster-view allocated within TRI_vocbase_t
* simplify per-cid view name, address 'catch' test failures
* ensure IResearchViewNode volatility is properly calculated in cluster
* invoke callbacks directly in AgencyMock instead of waiting for timeout
* ensure view updates via JavaScript always use the latest view definition
* pass a list of shards to `IResearchViewDBServer::snapshot`
* extend cluster aql tests
* fixes after merge
* fix class/struct inconsistencies
* comment failing tests
* remove debug logging
* add debug function
* tests cleanup
* simplify upcoming merge: pass resolver from a side
* backport: move all transaction status callback logic to Methods
* add changes missed from previous commit
* fix js and ruby tests
* more tests for IResearchViewNode
* pass transaction to IResearchViewDBServer::snapshot, address IResearchViewDBServer tests segfault
* pass transaction to IResearchView::snapshot instead of transaction state
* temporarily add trace log output to tests to try to find the cause of the core dump on Jenkins
* add more temporary debug output to trace down the segfault on Jenkins
* add even more temporary debug output to trace down the segfault on Jenkins
* ensure Vieew related maps are cleared during shutdown
* reset ClusterInfo::instance() before DatabaseFeature::unprepare()
* remove extraneous debug output
* missed line from previous commit
* uncomment required line
* add nullptr checks to RocksDBIndexFactory::prepareIndexes(...) similar to the ones in MMFilesIndexFactory::prepareIndexes(...)
* attempt to fix deadlock in tests
* add comment as per reviewer request
* fix aql test suite name
* add some debug logging
* address deadlock between ClusterInfo::loadPlan() and CollectionNameResolver::localNameLookup(...)
* eplicitly state which index definition failed in the log message
* use vocbase from shard-view isntead just in case
* explicitly state which index definition failed in the log message
* do not create shard-view instances from cluster-link instances (only register existing ones)
* add some tests
* further implementation of arangosearch query distribution
* do not store `aql::Collection` in `IResearchViewNode`, use `Query::collections()` instead
* some fixes
* cleanup
* some fixes after review
* more fixes after review
* use assertion instead of condition
* issue 373.2: move toVelocyPack into LogicalDataSource
* backport: move static DataSource related strings into StaticStrings, add support for registering snapshots on DBServer views