Remove duplicate cache columns
Normalize cat headers, add aliases

Closes #4852.
Add tera and peta to RestTable.renderValue()

Closes #4871
Install SecurityManager inside ElasticsearchTestCase for easier randomization

We currently run always with SecurityManager installed. To make sure we
work also without we should randomly swap it out ie. run without the
security manager.
_cat/allocation: Guaranteed to have at least zero shards
_cat/allocation: disk.avail can be zero, if so, want to show 100%

Closes #4835
fix if hook failure when running under jenkins

Local mode modification done previously faulty.  env[‘WORKSPACE’ is not
the sufficient discriminator to see if script is running under Jenkins.
  This fails on the Jenkins parent jobs since those type of jobs don’t
have WORKSPACE set.
[DOCS] Updated the breaking changes for the fields param

Closes #4888
Don't throttle the translog stage of recovery
After copying the index files (which are throttled), we currently throttle the translog as well. The translog phase3 part is performed under a lock, so its better not to throttle it at all, and move it as fast as possible.
update link to Hadoop Snapshot/Restore plugin
Fix test to use at least one document
mget REST API should support source parameter

As stated in documentation, we should support `?source=` parameter in mget REST operations.

This is how to reproduce it:

```sh
curl -XDELETE "http://localhost:9200/test"

curl -XPOST "http://localhost:9200/test/type/1?refresh" -d'{
    "foo": "bar"
}'

curl -XPOST "http://localhost:9200/test/type/_mget" -d'{
    "ids": ["1"]
}'

curl -XGET "http://localhost:9200/test/type/_mget?source=%7B%22ids%22%3A%20%5B%221%22%5D%7D"
```

Closes #4892.
Revert mget yaml test changes

Relative to #4892
Revert mget yaml test changes

Relative to #4892
Bulk: Failed preparsing does not fail whole bulk request

If a preparsing of the source is needed (due to mapping configuration,
which extracts the routing/id value from the source) and the source is not
valid JSON, then the whole bulk request is failed instead of a single
BulkRequest.

This commit ensures, that a broken JSON request is not forwarded to the
destination shard and creates an appropriate BulkItemResponse, which
includes a failure.

This also implied changing the BulkItemResponse serialization, because one
cannot be sure anymore, if a response includes an ID, in case it was not
specified and could not be extracted from the JSON.

Closes #4745
Cluster state toXContent serialization only returns needed data

In order to make sure, that only the requested data is returned to the client,
a couple of fixes have been applied in the ClusterState.toXContent() method.
Also some tests were added to the yaml test suite

Closes #4885
move msearch to use atomic array instead of synchronize
[TEST] Improved IndexAliasesTests

more assertAcked, removed TODO and needless sleep
Improved CreateIndexRequest and CreateIndexRequestBuilder javadocs
[TEST] Added REST tests for create index api