Some code-paths use anonymous classes (such as NonCollectingAggregator
in terms agg), which messes up the display name of the profiler.  If
we encounter an anonymous class, we need to grab the super's name.

Another naming issue was that ProfileAggs were not delegating to the
wrapped agg's name for toString(), leading to ugly display.

This PR also fixes up the profile documentation.  Some of the examples were
executing against empty indices, which shows different profile results
than a populated index (and made for confusing examples).

Finally, I switched the agg display names from the fully qualified name
to the simple name, so that it's similar to how the query profiles work.

Closes #26405

* master: (25 commits)
  Disable bwc tests in preparation of backporting #26931
  TemplateUpgradeService should only run on the master (#27294)
  Die with dignity while merging
  Fix profiling naming issues (#27133)
  Correctly encode warning headers
  Fixed references to Multi Index Syntax (#27283)
  Add an active Elasticsearch WordPress plugin link (#27279)
  Setting url parts as required to reflect the code base (#27263)
  keys in aggs percentiles need to be in quotes. (#26905)
  Align routing param type with search.json (#26958)
  Update to support bulk updates by query (#27172)
  Remove duplicated SnapshotStatus (#27276)
  add split index reference in indices.asciidoc
  Add ability to split shards (#26931)
  [Docs] Fix minor paragraph indentation error for multiple Indices params (#25535)
  Upgrade to Jackson 2.8.10 (#27230)
  Fix inconsistencies in the rest api specs for `tasks` (#27163)
  Adjust RestHighLevelClient method modifiers (#27238)
  Remove unused parameters in AnalysisRegistry (#27232)
  Add more information on `_failed_to_convert_` exception (#27034)
  ...

* ccr: (127 commits)
  Disable bwc tests in preparation of backporting elastic#26931
  TemplateUpgradeService should only run on the master (elastic#27294)
  Die with dignity while merging
  Fix profiling naming issues (elastic#27133)
  Correctly encode warning headers
  Fixed references to Multi Index Syntax (elastic#27283)
  Add an active Elasticsearch WordPress plugin link (elastic#27279)
  Setting url parts as required to reflect the code base (elastic#27263)
  keys in aggs percentiles need to be in quotes. (elastic#26905)
  Align routing param type with search.json (elastic#26958)
  Update to support bulk updates by query (elastic#27172)
  Remove duplicated SnapshotStatus (elastic#27276)
  add split index reference in indices.asciidoc
  Add ability to split shards (elastic#26931)
  [Docs] Fix minor paragraph indentation error for multiple Indices params (elastic#25535)
  Upgrade to Jackson 2.8.10 (elastic#27230)
  Fix inconsistencies in the rest api specs for `tasks` (elastic#27163)
  Adjust RestHighLevelClient method modifiers (elastic#27238)
  Remove unused parameters in AnalysisRegistry (elastic#27232)
  Add more information on `_failed_to_convert_` exception (elastic#27034)
  ...

* 6.x:
  Update shrink's bwc version to 6.1.0
  add split index reference in indices.asciidoc
  Add ability to split shards (#26931)
  TemplateUpgradeService should only run on the master (#27294)
  Die with dignity while merging
  Fix profiling naming issues (#27133)
  Correctly encode warning headers
  Fixed references to Multi Index Syntax (#27283)
  Add an active Elasticsearch WordPress plugin link (#27279)
  Setting url parts as required to reflect the code base (#27263)
  keys in aggs percentiles need to be in quotes. (#26905)
  Align routing param type with search.json (#26958)
  Update to support bulk updates by query (#27172)
  Remove duplicated SnapshotStatus (#27276)

* master: (556 commits)
  Fix find remote when building BWC
  Remove colons from task and configuration names
  Add unreleased 5.6.5 version number
  testCreateSplitIndexToN: do not set `routing_partition_size` to >= `number_of_routing_shards`
  Snapshot/Restore: better handle incorrect chunk_size settings in FS repo (elastic#26844)
  Add limits for ngram and shingle settings (elastic#27211) (elastic#27318)
  Correct comment in index shard test
  Roll translog generation on primary promotion
  ObjectParser: Replace IllegalStateException with ParsingException (elastic#27302)
  scripted_metric _agg parameter disappears if params are provided (elastic#27159)
  Update discovery-ec2.asciidoc
  Update shrink's bwc version to 6.1.0 and enabled bwc tests
  Add limits for ngram and shingle settings (elastic#27211)
  Disable bwc tests in preparation of backporting elastic#26931
  TemplateUpgradeService should only run on the master (elastic#27294)
  Die with dignity while merging
  Fix profiling naming issues (elastic#27133)
  Correctly encode warning headers
  Fixed references to Multi Index Syntax (elastic#27283)
  Add an active Elasticsearch WordPress plugin link (elastic#27279)
  ...