[DOCS] added `discovery.zen.publish_timeout` to the dynamic settings list
[DOCS] Documented `discovery.zen.publish_timeout` setting
Improved ClusterSettingsTests

more assertAcked, checked that the `discovery.zen.publish_timeout` has been changed in `DiscoverySettings`, removed restriction on number of nodes, doesn't seem needed.
Minor cleanups in ShardsLimitAllocationDecider
[DOCS] added coming tags for `zen.discovery.publish_timeout` made dynamic
Made highlight query also work in the percolate api.
[DOCS] Changed coming[] to added[] for 1.0.0*
[DOCS] should use setPostFilter instead of setFilter
fixed markup and typo
[DOCS] add DynamoDB river plugin
add elasticsearch-osem to integrations page
[DOCS] fixed count and validate query docs, they now require a top-level query object, same as other apis

Relates to #4074
Closes #5111
[DOCS] rephrased delete by query docs
Merge branch 'master' of github.com:kzwang/elasticsearch