Don't use TransportClient on FullClusterRestartTests

There seems to be an issue with this test since it shuts down random
nodes and TransportClients seem to be confused due to that. For
now we disable them to figure out if this is the cause of the sporadic
timeouts.
Added Booleans.isBoolean to allow detecting whether a char sequence contains a boolean value. Added XContentParser.isBooleanValue to allow testing if current value is of boolean nature.

Boolean values:
boolean type values
numeric (0 == false)
one of the following strings: "true","false","on","off","yes","no","0","1"
Use XContentParser.isBooleanValue to detect all boolean values for the `_source` parameter for both _mget and _search

 Closes #3981
Added a ClusterHealthResponse.toString implementation for better error reporting in FullRollingRestartTests timeout failures.
Assert on failures in QueryRescorerTests
Make ContextIndexSearcher delegate more method calls to Engine.searcher().

When running tests, Engine.searcher() is going to be an AssertingIndexSearcher
so we definitely don't want to discard it. This commit fixes it as well as the
bugs it found.

Closes #3987
rename and document "index.mapping.date.parse_upper_inclusive" setting for date fields

The setting causes the upper bound for a range query/filter to be rounded up,
therefore the name `round_ceil` seems to make more sense.

Also this commit removes the redundant fourth parameter to DateMathParser.parse(..)
which was never used.
was:    parse(String text, long now, boolean roundUp, boolean upperInclusive)
is now: parse(String text, long now, boolean roundCeil)

closes #3914
Add version to prebuilt analyzers

This patch takes the version of the created index into account when a
prebuilt analyzer is created.
So, if an index was created with 0.90.4, then the prebuilt analyzers
will be the same than on the 0.90.4 release.

One reason for this feature is the possibility to change pre built
analyzers like the standard one.

The patch tries to reuse analyzers as mutch as possible. So even if
version X.Y.Z and X.Y.A use the same lucene analyzers, the same instance
is reused in order to prevent overcreation of lucene analyzer instances.

Closes #3790
Making unit test future proof by using old version, in case versions change
Add the 'recovery' _cat API endpoint

This addes the _cat/recovery/{index} API endpoint, which displays
information about the status of recovering shards. An example of the
output:

index shard node                   target    recovered     %
test2 0     Fwo7c_6MSdWM0uM1Ho4t-g 147304414  19236101 13.1%
test  0     Fwo7c_6MSdWM0uM1Ho4t-g 145891423 119640535 82.0%

Fixes #3969
mget API should support global routing parameter

mget API support `_routing` field but not `routing` parameter.

Reproduction here:

```sh
curl -XDELETE "http://localhost:9200/test/"; echo
curl -XPUT "http://localhost:9200/test/" -d'{
   "settings": {
      "number_of_replicas": 0,
      "number_of_shards": 5
   }
}'; echo

curl -XPUT 'http://localhost:9200/test/order/1-1?routing=key1' -d '{
   "productName":"doc 1"
}'; echo
curl -XPUT 'http://localhost:9200/test/order/1-2?routing=key1' -d '{
   "productName":"doc 2"
}'; echo
curl -XPUT 'http://localhost:9200/test/order/1-3?routing=key1&refresh=true' -d '{
   "productName":"doc 3"
}'; echo

curl -XPOST 'http://localhost:9200/test/order/_mget?pretty' -d '{
    "docs" : [
        {
            "_index" : "test",
            "_type" : "order",
            "_id" : "1-1",
            "_routing" : "key1"
        },
        {
            "_index" : "test",
            "_type" : "order",
            "_id" : "1-2",
            "_routing" : "key1"
        },
        {
            "_index" : "test",
            "_type" : "order",
            "_id" : "1-3",
            "_routing" : "key1"
        }
    ]
}'; echo

curl -XPOST 'http://localhost:9200/test/order/_mget?pretty&routing=key1' -d '{
	"ids": [
		"1-1",
		"1-2",
		"1-3"
	]
}'; echo
```

Closes #3996.
Fix String.format to use Locale.ROOT in RestRecoveryAction
Fixed test cluster scope to be able to run it multiple times if needed
Added ack call when the cluster state has not changed

The missing call could cause a cluster state update to hang in case there is no change no apply
Added support for acknowledgement in update index settings api

Added support for serialization based on version to AcknowledgedResponse. Useful in api that don't support yet the acknowledged flag in the response.
Moved also ack warmer tests to more specific AckTests class

Close #3983
Added support for node acknowledgements in delete mapping api

Closes #3984
Added support for acknowledgements to cluster reroute api

Closes #3985
Added support for acknowledgements to update cluster settings api

As a side note, the internal reroute call is now part of the ack mechanism. That means that if the response contains acknowledged flag, the internal reroute that was eventually issued was acknowledged too. Also, even if the request is not acknowledged, the reroute is issued before returning, which means that there is no need to manually call reroute afterwards to make sure the new settings are immediately applied.

Closes #3995
Improving test stability for CompletionTests

Randomized testing caught an issue showing that the test should
flush after indexing a document, as always the same document is
indexed.
[DOCS] Extending setup as a service documentation

* Tell people to use ES_JAVA_OPTS for es.node.name or similar parameters
* Showing a simple way to install Oracle JDK on ubuntu/debian

Closes #3999