Mapping: Fixes Merging of default analyzer

Fixed behaviour where two representations of the default index analyzer weren't being treated as equivalent. Added REST test to confirm fix.

Closes #2716
Configuration: Tab characters in YAML should throw an exception.

Throw an exception if there is a 'tab' character in the elasticsearch.yml file

Close #8259
Core: In the bitset cache only eagerly load bitsets for parent nested object fields.

Don't eagerly cache parent type filters in bitset cache or nested object fields that are leafs.
Also let parent/child queries not rely on FixedBitSetFilter, but rather on regular Filter

Closes #8440
Aggregations: Changed child filters to not require a random access based bitset in `nested` agg.
Also the nested agg now requires docs to be consumed / scored in order.

Closes #8454
Percolator: Remove `index.percolator.allow_unmapped_fields` setting.

There should be no option to opt out from strict field resolution for percolator query parsing.

Closes #8439
Logging: BroadcastOperationAction - added trace logging for successful shard-level responses

In order to be able to trace the exact shards that participated in the operation.
[CORE] Intorduce shards level locks to prevent concurrent shard modifications

Today it's possible that the data directory for a single shard is used by more than on
IndexShard->Store instances. While one shard is already closed but has a concurrent recovery
running and a new shard is creating it's engine files can conflict and data can potentially
be lost. We also remove shards data without checking if there are still users of the files
or if files are still open which can cause pending writes / flushes or the delete operation
to fail. If the latter is the case the index might be treated as a dangeling index and is brought
back to life at a later point in time.

This commit introduces a shard level lock that prevents modifications to the shard data
while it's still in use. Locks are created per shard and maintined in NodeEnvironment.java.
In contrast to most java concurrency primitives those locks are not reentrant.

This commit also adds infrastructure that checks if all shard locks are released after tests.
Fix synchronization - leftover from refactoring
[TEST] Close node env otherwise windows can't delete tmp files
Prevent double wrapping directories in MockDirectoryWrapper
Test: CorruptedFileTest.testCorruptionOnNetworkLayer used node settings when creating an index

Test used `indices.recovery.concurrent_streams` when creating an index but this is a node setting. Moved it to the node settings and added similar settings to speed up concurrent recoveries.

Also fixed a misleading log message in ShardRecoveryHandler when logging a remove corruption
Test: Let the random parent/child tests use the query and filter parsers instead of creating the queries and filters in a custom way.

By using the query and filter parsers we increase the test coverage and make the random parent/child tests simpler.
Docs: Add Wireshark protocol dissection support

Hi guys, I've finished my Wireshark dissector for Elasticsearch. It is now merged into their master. See https://code.wireshark.org/review/#/c/4948/

Closes #8495