* start maintenance arangosearch threads after recovery is done
* ensure flush subscription is not being deallocated while in use
* add some tests
* properly determine storage engine
* adjust default view options
* stick to old index meta format in 3.5
* address test failures
* and cluster tests
* move IResearchViewSort into separate unit
* ensure sort is propagated to IResearchLink
* update iresearch and extend some tests
* implement insertion of sorted values, store value comparator in link
* add tests for VPackComparer
* minor cleanup
* fix issue with sort definiton propagation
* propagate error message from index factory
* add integration tests for sorted indexes, single server
* initial implementation of IResearchViewMergeExecutor
* move iresearch::VPackComparer to separate translation unit
* store collection in IndexReadBuffer for IResearchViewMergeExecutor
* set primary sort from optimizer rule
* add some tests for sorted view case
* extend IResearchViewNode tests
* simplify primary sort definition
* pretty print order condition covered by arangosearch in query explanation
* fix compilation with g++-8
* address catch test failures
* fix tests
* adjust arangosearch optimizer rule to optimize sort in case of cluster
* make tests for sorted indexes work in cluster too
* fix tests
* extend js tests for sorted indices
* fix keyword in query explainer
* ensure sort-limit rule works with views
* backport ngram analyzer fix from upstream
* address jslint errors
* modify IResearchViewSort to support boolean direction specification format
* add some tests
* add tests
* add skip functionality
* extend tests
* add more catch tests
* inline some methods
* address jslint errors
* extend catch tests to reproduce the failure
* add some tests for check fullcount
* add more tests
* extend tests
* temporarily comment out broken tests
* extend js tests
* address review comments
* address jslint errors
* update iresearch
* optimize away SortNode in case it is covered by an arangosearch view
this implementation is a stub with hard-coded attribute names
* extend IResearchViewMeta with sorting order definition
* make 'IResearchViewMeta::Sort' compatible with 'SortCondition' API
* ensure ArangSearch sort is immutable after creation
* address review comments
* issue 506.3: use camel-case configuration parameter names consistntly, add a configuration version property to iresearch view meta
* backport: ensure meta version is supported
* backport: hide 'version' property from non-persistence json
* 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
* update iresearch to codebase as of 20181011
* backport: address cluster test failures
* backport: address dump test failures
* backport: address discrepency in view creation between single-server and cluster
* backport: address test failure on cluster (revert change)
* backport: address test failures
* backport: address MSVC build issues
* backport: address issue with LogicalDatasource destructing after TRI_vocbase_t
* Revert "backport: address issue with LogicalDatasource destructing after TRI_vocbase_t"
This reverts commit 4f9880bbaa22194dfbb604b5a54658de1d447ac1.
* issue 450.3: use a single configuration policy differentiated by 'type' with arbitrary number of configurable parameters
* ensure test data is persisted to the test directory
* add missed declaration
* fix typo
* add full namespace and includes
* issue 400.2.4: register IResearchView sync tasks with IResearchFeature, remove unused configuration parameter
* set flag before notify, fix failures in new tests from 'devel'
* revert set flag before notify, fix more failures in new tests from 'devel'
* fix even more failures in new tests from 'devel', backport: do not reset notification flag if pending tasks were seen
* fix still more failures in new tests from 'devel'
* try to work around buggy test failures
* issue 401.2: split IResearchViewMeta into the user configurable part and internal state
* backport: update documentation and integration tests to reflect the IResearchViewMeta changes
* backport: addresss typo
* backport: address another typo