Compress PagedBytesAtomicFieldData's termOrdToBytesOffset.

Using MonotonicAppendingLongBuffer instead of a GrowableWriter should help
save several bits per value, especially when the bytes to store have similar
lengths.

Closes #3186
Expose timeout for nodes_info requests in the REST interface

Closes #3191
Merge pull request #3192 from clintongormley/nodes_info_timeout

Expose timeout for nodes_info requests in the REST interface
Added `doc_as_upsert` option to update api.
This option can reduce to amount of data being send to Elasticsearch.
Closes #3195
Simplified validate check
Ensure tests wait for relocations
create 'shape' index explicitly to ensure tests don't hang
Add support for "high_freq" and "low_freq" parameters for Common Query
"minimum_should_match" parameter. High freq parameters is used when the
query has only high frequent terms.

Closes #3188
Add ShardId and Index to SuggestionContext

Suggesters might need access to the shard they run on as well as the
index they operate on. This patch adds indexname and shard ID to the
SuggestionContext

Closes #3199
Upgrade to Lucene 4.3.1
Import the new n-gram tokenizers and filters from Lucene.

Lucene 4.4 will feature new n-gram tokenizers and filters that should not
generate broken offsets (that cause highlighting bugs) anymore. They also
correctly handle supplementary characters and the tokenizers can work in a
streaming fashion (they are not limited to the first 1024 chars of the
stream anymore).
Trimming MVEL scripts before compiling them.

This bypasses an issue with MVEL error handling why can go into an infinite loop in some edge cases. More info here: http://jira.codehaus.org/browse/MVEL-292

Closes #3168
The "fielddata" qs param to index stats was setting idCache, not fieldData

Closes #3204
Expose fielddata "fields" param in standard in indicesStatsRequest

Closes #3205
GeoHash Filter
##############

Previous versions of the GeoPointFieldMapper just stored the actual geohash
of a point. This commit changes the behavior of storing geohashes by storing
the geohash and all its prefixes in decreasing order in the same field. To
enable this functionality the option geohash_prefix must be set in the mapping.

This behavior allows to filter GeoPoints by their geohashes. Basically a
geohash prefix is defined by the filter and all geohashes that match this
prefix will be returned. The neighbors flag allows to filter geohashes
that surround the given geohash cell. In general the neighborhood of a
geohash is defined by its eight adjacent cells.

To enable this, the type of filtered fields must be geo_point with geohashes
and geohash_prefix enabled.

For example:
    curl -XPUT 'http://127.0.0.1:9200/locations/?pretty=true' -d '{
        "mappings" : {
            "location": {
                "properties": {
                    "pin": {
                        "type": "geo_point",
                        "geohash": true,
                        "geohash_prefix": true
                    }
                }
            }
        }
    }'

This example defines a mapping for a type location in an index locations
with a field pin. The option geohash arranges storing the geohash of
the pin field.

To filter the results by the geohash a geohash_cell needs to be defined.
For example
    curl -XGET 'http://127.0.0.1:9200/locations/_search?pretty=true' -d '{
        "query": {
            "match_all":{}
        },
        "filter": {
            "geohash_cell": {
                "field": "pin",
                "geohash": "u30",
                "neighbors": true
            }
        }
    }'

This filter will match all geohashes that start with one of the following
prefixes: u30, u1r, u32, u33, u1p, u31, u0z, u2b and u2c.

Internally the GeoHashFilter is either a simple TermFilter, in case no
neighbors should be filtered or a BooleanFilter combining the TermFilters
of the geohash and all its neighbors.

Closes #2778
Add Lucene CommonGrams/CommonGramsQuery token fiter
Both filters merged in a single "common_grams" tokenfilter.

Closes #3202
Added version support to update requests

Moved version handling from RobinEngine into VersionType. This avoids code re-use and makes it cleaner and easier to read.

Closes #3111
stabelize more tests
Terms Filter Lookup: Failure when no mappings for the terms field exists (no data indexed)
closes #3216
improve geohash_filter to use terms filter
and various other cleanups