[Docs] value_count supports script per 1.1
[DOCS] Fix terms agg value script example
[DOCS] Make apt/yum repos more visible
Added `cross_fields` mode to multi_match query

`cross_fields` attemps to treat fields with the same analysis
configuration as a single field and uses maximum score promotion or
combination of the scores based depending on the `use_dis_max` setting.
By default scores are combined. `cross_fields` can also search across
fields of hetrogenous types for instance if numbers can be part of
the query it makes sense to search also on numeric fields if an analyzer
is provided in the reqeust.

Relates to #2959
Updated nodes info endpoint in elasticsearch.yml

Relates to #4055
Fixed the string() code literal in the java client index api doc.
[DOCS] organize a bit the repository plugins

(cherry picked from commit 88e1c20c4581885db7e5e65edf7eb3629c2d31ca)
Add fuzzy/slop support to `simple_query_string`

Ports the change from https://issues.apache.org/jira/browse/LUCENE-5410
Add Marvel and Paramedic to config file
add redis transport plugin
[DOCS] Added backwards compatibility instructions to Perl client
Add IndexReader reference counting methods to forbidden APIs.
Be paranoid about double release.
Use patched version of ReferenceManager to prevent infinite loop in
RefrenceManager#accquire()

See LUCENE-5436
[DOCS] delete by query requires a top-level query parameter

Closes #5044
(cherry picked from commit 1e265b3)
Fix BytesRef owning issue in string terms aggregations.

The byte[] array that was used to store the term was owned by the BytesRefHash
which is used to compute counts. However, the BytesRefHash is released at some
point and its content may be recycled.

MockPageCacheRecycler has been improved to expose this issue (putting random
content into the arrays upon release).

Number of documents/terms have been increased in RandomTests to make sure page
recycling occurs.

Close #5021
Make size=0 return all buckets for the geohash_grid aggregation.

Close #4875
fixed trace logging hidden by check for isDebugEnabled
Extend ElasticsearchLuceneTestCase rather than LuceneTestCase

LuceneTestCase misses some thread filters that might fail a test
since a background cluster is still running from a previous test.
Upgrading analysis plugins fails

When an analysis plugins provides default index settings using `PreBuiltAnalyzerProviderFactory`,  `PreBuiltTokenFilterFactoryFactory` or `PreBuiltTokenizerFactoryFactory` it fails when upgrading it with elasticsearch superior or equal to 0.90.5.

Related issue: #4936

Fix is needed in core. But, in the meantime, analysis plugins developers can fix that issue by overloading default prebuilt factories.

For example:

```java
public class StempelAnalyzerProviderFactory extends PreBuiltAnalyzerProviderFactory {

    private final PreBuiltAnalyzerProvider analyzerProvider;

    public StempelAnalyzerProviderFactory(String name, AnalyzerScope scope, Analyzer analyzer) {
        super(name, scope, analyzer);
        analyzerProvider = new PreBuiltAnalyzerProvider(name, scope, analyzer);
    }

    @Override
    public AnalyzerProvider create(String name, Settings settings) {
        return analyzerProvider;
    }

    public Analyzer analyzer() {
        return analyzerProvider.get();
    }
}
```

And instead of:

```java
    @Inject
    public PolishIndicesAnalysis(Settings settings, IndicesAnalysisService indicesAnalysisService) {
        super(settings);
        indicesAnalysisService.analyzerProviderFactories().put("polish", new PreBuiltAnalyzerProviderFactory("polish", AnalyzerScope.INDICES, new PolishAnalyzer(Lucene.ANALYZER_VERSION)));
    }
```

do

```java
    @Inject
    public PolishIndicesAnalysis(Settings settings, IndicesAnalysisService indicesAnalysisService) {
        super(settings);
        indicesAnalysisService.analyzerProviderFactories().put("polish", new StempelAnalyzerProviderFactory("polish", AnalyzerScope.INDICES, new PolishAnalyzer(Lucene.ANALYZER_VERSION)));
    }
```

Closes #5030