make sure we wrap a potential failure in sending master state change in a catch
Improved how aliases are handled in the cluster state.

The following changes improved alias creation:
* Moved away from ImmutableMap to JCF's UnmodifiableMap. The ImmutableMap always made a copy, whereas the UnmodifiableMap just wraps the target map.
* Reducing the number of maps being created during the creation of MetaData and IndexMetadata.
* Changed IndexAliasesService's aliases from a copy on write ImmutableMap to ConcurrentMap.

Closes #3410
Use Analyzer.tokenStream(fieldName, text) instead of Analyzer.tokenStream(fieldName, new StringReader(text)).

Lucene 4.4 introduced the tokenStream(String fieldName, String text) helper
method which nicely reuses the string reader. Whenever analyzing Strings, we
should use this method instead of using the Reader method with a
(Fast)StringReader.

Closes #3409
ElasticsearchAssertions.assertHitCount variants now report shard failure upon fail.

Cleaned up a UpdateNumberOfReplicasTests a bit.
removed a left over  assert made redundant by last commit
Delete API ack to wait also for actual deletion of shards from disk
closes #3413
auto_expand_replicas causing very large amount of cluster state changes when a node joins or leaves the cluster

Closes #3399
don't call the refresh mapping listener callback twice
though not harmful, results in an annoying transport service log
Forbid usage of StringReader in favor of FastStringReader.

StringReader is synchronized although input streams should always be consumed
by a single thread at a time. FastStringReader on the other hand is completely
thread unsafe.

Closes #3411
Added prefix suggestions based on AnalyzingSuggester

This commit introduces near realtime suggestions. For more information about
its usage refer to github issue #3376

From the implementation point of view, a custom AnalyzingSuggester is used
in combination with a custom postingsformat (which is not exposed to the user
anywhere for him to use).