* Changes since last PR: use LogicalDataSource for Methods::StateRegistrationCallback instead of TRI_voc_cid_t to avoid unnecessary lookups
* backport: address cluster LogicalDataSource resolution failure
* remove some non-unused V8 persistents
* do not throw that many bogus assertions
* do not rely on server role being defined
* slightly better debug output for V8 context debugging
* fix collection ids in inventory response
* simplify bootstrap a bit
* slightly better error handling
* make elapsed time a queryable value
* use less memory for stub collections
* added assertions that will always make sense
* added assertions
* do not garbage-collect while waiting
* less copying of parameters
* do not show "load indexes into memory" buttons for mmfiles engine
as all indexes are in memory anyway
* when a collection is truncated via the web interface, flush the WAL and rotate all active journals
this will make close all open journals on leader and followers and make them subject to compaction opportunities
* fix invalid server id values being passed from web interface to backend
* introduce afterTruncate method for indexes
* added test case for issue #3447
* updated CHANGELOG
* don't warn about replicationFactor for system collections
* check that the queries actually use the geo index and not some other index
* properly report error in web interface
* fix some internals checks that made truncate fail for bigger collections in maintainer mode
* also run a compact() operation after a serious truncate
in order to make iteration over the truncated range much faster
when the collection is next accessed
* increase default maximum number of V8 contexts to at least 16
* properly initialize all properties
* use faster comparison
* properly detect and handle "method not allowed"
* code-style
* remove unused variable
* narrow variable scope
* handle non-existance of AuthenticationFeature
* remove dead code
* replace some C string handling with std::strings
* moved assertion to the correct place
* honor number of array members for IN operator
* slightly adjust error messages
* slighty adjust some error messages
* try to fix issue with lingering replication contexts on shutdown
* clean up heartbeat thread a little bit
* small fixes
* fixed issue #3075
* update the known issues document, as some issues have already been fixed
* speed up equality lookups in unique vpack indexes
* Allow for re-use of RocksDBKey objects through transaction leaser.
* Converted all RocksDBKey variants to non-static constructors.
* remove API docs for endpoints that were deleted in 3.0
* remove unused variable
* set all scalar values in the ctor, so check tools do not complain
* move Result objects
* prevent potential nullptr access
* remove ambiguous boolean parameter with no clear meaning
* make code check tools happy
* don't allow copying cache Findings, allow moving Results
* the debug functionality for counting RocksDB key ranges was broken
this produced sporadic test failures
* remove superfluous iostream include
* fix range checks
* don't leak if an error happens during database removal
* try to simplify Result a bit
* try to deletion checks a bit more robust
* add "cluster selectivity estimates" to CHANGELOG
* add some documentation to RocksDBRestReplicationHandler
* fix building with relative paths
* add some more doc
* add some tests for the replication api
* fix RocksDBRestReplicationHandler and add tests
* update documentation
* remove obsolete parameter
* fix error message
* Implementing logger-first-tick, logger-tick-ranges. Fixing dump `chunkSize` documentation
* cleaning up several duplicate versions of Index::memory, Index::cleanup, Index::drop, integrating branch issue-383-ensure-delete
* fixing wrong column family
* reduce extractions to projections
* recycle string buffers in SocketTask
* micro optimizations for mmfiles indexes
* added special lookup function for _key
* moved function into the correct file
* speed up key buffer allocations a bit
* added noexcept specifier
* correctly name variable
* explicitly move bounds
* fix and speedup from/toPersistent functions
* reuse string from ManagedDocumentResult for multiple lookups
* use move-assign
* a bit less work for single server
* speedup AQL function HASH
* single fetch optimization
* performance optimization for the case when no documents need to be returned
* make reduce-extraction-to-projection a RocksDB-only optimizer rule
* cppcheck
* try to fix compile error on MacOS
* bug fix for MacOSX
* missing namespace (in Windows compile)
* reduce extractions to projections
* recycle string buffers in SocketTask
* micro optimizations for mmfiles indexes
* added special lookup function for _key
* moved function into the correct file
* speed up key buffer allocations a bit
* added noexcept specifier
* correctly name variable
* explicitly move bounds
* fix and speedup from/toPersistent functions
* reuse string from ManagedDocumentResult for multiple lookups
* use move-assign
* a bit less work for single server
* speedup AQL function HASH
* single fetch optimization
* performance optimization for the case when no documents need to be returned
* make reduce-extraction-to-projection a RocksDB-only optimizer rule