Docs: Fixed missing comma in multi match query example
[Tests] remove bigArrays which were not fully release from watch list (and still fail the test)

This is to prevent future tests from failing due to these arrays
[TEST] Stabelize BWC tests for version < 1.1.0
Docs: Add clarifying text about regexp and terms

For the casual reader, the reference to "term queries" may be glossed over, yielding an unexpected result when using `regexp` queries.
This attempts to make that distinction more prominent.

Closes #6698
[TEST] Expose `tests.filter` for elasticsearch tests.

`-Dtests.filter` allows to pass filter expressions to the elasticsearch
tests. This allows to filter test annotaged with TestGroup annotations
like @Slow, @Nightly, @Backwards, @Integration with a boolean expresssion like:

 * to run only backwards tests run:
     `mvn -Dtests.bwc.version=X.Y.Z -Dtests.filter="@backwards"`
 * to run all integration tests but skip slow tests run:
     `mvn -Dtests.filter="@integration and not @slow"
 * to take defaults into account ie run all test as well as backwards:
     `mvn -Dtests.filter="default and @backwards"

This feature is a more powerful alternative to flags like
`-Dtests.nighly=true|false` etc.

Closes #6703
Analysis: Add additional Analyzers, Tokenizers, and TokenFilters from Lucene

Add `irish` analyzer
Add `sorani` analyzer (Kurdish)

Add `classic` tokenizer: specific to english text and tries to recognize hostnames, companies, acronyms, etc.
Add `thai` tokenizer: segments thai text into words.

Add `classic` tokenfilter: cleans up acronyms and possessives from classic tokenizer
Add `apostrophe` tokenfilter: removes text after apostrophe and the apostrophe itself
Add `german_normalization` tokenfilter: umlaut/sharp S normalization
Add `hindi_normalization` tokenfilter: accounts for hindi spelling differences
Add `indic_normalization` tokenfilter: accounts for different unicode representations in Indian languages
Add `sorani_normalization` tokenfilter: normalizes kurdish text
Add `scandinavian_normalization` tokenfilter: normalizes Norwegian, Danish, Swedish text
Add `scandinavian_folding` tokenfilter: much more aggressive form of `scandinavian_normalization`
Add additional languages to stemmer tokenfilter: `galician`, `minimal_galician`, `irish`, `sorani`, `light_nynorsk`, `minimal_nynorsk`

Add support access to default Thai stopword set "_thai_"

Fix some bugs and broken links in documentation.

Closes #5935
[TEST] Wait for cluster consistency before tests starts
Fix doc formatting. Norwegian stemmers and Scandinavian normalizers
were missing commas between entries.
[TEST] Exclude SORANI analyzer if compatibility version is < 1.3.0
Docs: Fix typo in timestamp-field.asciidoc

Closes #6661
Docs: unescape regexes in Pattern Tokenizer docs

Currently regexes in Pattern Tokenizer docs are escaped (it seems according to Java rules). I think it is better not to escape them because JSON escaping should be automatic in client libraries, and string escaping depends on a client language used. The default pattern is `\W+`, not `\\W+`.

Closes #6615
[Discovery] Fault detection should also check  cause exceptions for disconnects

The change introduced in #6686 checks for ConnectionTransportException during pinging. However, transport layer wraps it in  SendRequestTransportException
[TEST] Split up random bulks more often and also if the document set is smallish