Shutdown: Add support for Ctrl-Close event on Windows platforms to gracefully shutdown node

This commit adds the support for the Ctrl-Close event on Windows using native system calls. This way, it is possible to catch the Ctrl-Close event sent by a 'taskill /pid' command (or when the user closes the console window where elasticsearch.bat was started) and gracefully close the node. Before this commit, the node was simply killed on taskkill/window closing.
Mappings: Reencode transformed result with same xcontent

When I originally wrote the transform feature I didn't think that the
XContentType of the reencoded source mattered.  It actually matters because
payloads for the completion suggester are stored and returned exactly
as encoded by this XContentType.

This revision changes the transform feature from always reencoding with smile
to always reencoding with the provided XContentType to support the completion
suggester.

Closes #8959
Mappings: Include currentFieldName into ObjectMapper errors

Without currentFieldName error is very generic and non informative

Close #9020
Aggregations: Adds methods to get to/from as Strings for Range Aggs

Adds getToAsString and getFromAsString to Range interface and implements them for all range aggregations

Closes #9003
[Docs] Improve documentation of the new caching policy for filters.
[GEO] Add optional left/right parameter to GeoJSON

This feature adds an optional orientation parameter to the GeoJSON document and geo_shape mapping enabling users to explicitly define how they want Elasticsearch to interpret vertex ordering.  The default uses the right-hand rule (counterclockwise for outer ring, clockwise for inner ring) complying with OGC Simple Feature Access standards. The parameter can be explicitly specified for an entire index using the geo_shape mapping by adding "orientation":{"left"|"right"|"cw"|"ccw"|"clockwise"|"counterclockwise"} and/or overridden on each insert by adding the same parameter to the GeoJSON document.

closes #8764
[GEO] Removing unnecessary orientation enumerators

PR #8978 included 4 unnecessary enumeration values ('cw', 'clockwise', 'ccw', 'counterclockwise'). Since the ShapeBuilder.parse method handles these as strings and maps them to LEFT and RIGHT enumerators, respectively, their enumeration counterpart is unnecessary. This minor change adds 4 static convenience variables (COUNTER_CLOCKWISE, CLOCKWISE, CCW, CW) for purposes of the API and removes the unnecessary values from the Orientation Enum.

closes #9035
Fix date histogram docs grammar.
ignore intellij project/workspace files

closes #9044
Search: parse terms filters on a single term as a term filter.

Running a terms filter on a single term is equivalent to loading a postings
list into a bit set and then returning the bit set instead of reading the
postings list on the fly.

Close #9014
Core: Terms filter lookup caching should cache values, not filters.

The terms filter lookup mechanism today caches filters. Because of this, the
cache values depend on two things: the values that can be found in the lookup
index AND the mapping of the local index, since changing the mapping can change
the way that the filter is parsed. We should make the cache depend solely on
the content of the lookup index.

For instance the issue I was seeing was due to the following scenario:
 - create index1 with _id indexed
 - run terms filter with lookup, the parsed filter looks like `_id: 1 OR _id: 2`
 - remove index1
 - create index1 with _id not indexed
 - run terms filter without lookup, the parsed filter is `_uid: type#1 OR _uid: type#2` (the _id field mapper knows how to use the _uid field when _id is not indexed)
 - run terms filter with lookup, the filter is fetched from the cache: `_id: 1 OR _id: 2` but does not match anything since `_id` is not indexed.

Close #9027
Parent/child: Fix concurrency issues of the _parent field data.

`_parent` field data mistakenly shared some stateful data-structures across
threads.

Close #8396
Core: `ignore_unavailable` shouldn't ignore closed indices if a single index is specified in a search or broadcast request.

Closes #9047
Closes #7153
[TESTS] Make sure to wait for all shards to be allocated before running the test.
inner_hits: Added another more compact syntax for inner hits.

Closes #8770
Merge pull request #2 from elasticsearch/master

merge