Serverless Available APIs and tests

[picandocodigo]

The following is a list of available APIs in Elasticsearch Serverless. The checked ones include a test in this repository.
I'm opening another issue for machine_learning APIs since there are so many of them: #18

• async_search.delete
• async_search.get
• async_search.status
• async_search.submit
• bulk
• cat.aliases
• cat.component_templates
• cat.count
• cat.help
• cat.indices
• cat.ml_data_frame_analytics
• cat.ml_datafeeds
• cat.ml_jobs
• cat.ml_trained_models
• cat.transforms
• clear_scroll
• close_point_in_time
• cluster.delete_component_template
• cluster.exists_component_template
• cluster.get_component_template
• cluster.info
• cluster.put_component_template
• count
• create
• delete
• delete_by_query
• delete_script
• enrich.delete_policy
• enrich.execute_policy
• enrich.get_policy
• enrich.put_policy
• enrich.stats
• eql.delete
• eql.get
• eql.get_status
• eql.search
• exists
• exists_source
• explain
• field_caps
• get
• get_script
• get_source
• graph.explore
• index
• indices.add_block
• indices.analyze
• indices.create
• indices.create_data_stream
• indices.data_streams_stats
• indices.delete
• indices.delete_alias
• indices.delete_data_lifecycle
• indices.delete_data_stream
• indices.delete_index_template
• indices.exists
• indices.exists_alias
• indices.exists_index_template
• indices.explain_data_lifecycle
• indices.get
• indices.get_alias
• indices.get_data_lifecycle
• indices.get_data_stream
• indices.get_index_template
• indices.get_mapping
• indices.get_settings
• indices.migrate_to_data_stream
• indices.modify_data_stream
• indices.put_alias
• indices.put_data_lifecycle
• indices.put_index_template
• indices.put_mapping
• indices.put_settings
• indices.refresh
• indices.resolve_index
• indices.rollover
• indices.simulate_index_template
• indices.simulate_template
• indices.update_aliases
• indices.validate_query
• info
• ingest.delete_pipeline
• ingest.get_pipeline
• ingest.processor_grok
• ingest.put_pipeline
• ingest.simulate
• license.get
• logstash.delete_pipeline
• logstash.get_pipeline
• logstash.put_pipeline
• mget
• msearch
• msearch_template
• mtermvectors
• open_point_in_time
• ping
• put_script
• query_ruleset.delete
• query_ruleset.get
• query_ruleset.list
• query_ruleset.put
• rank_eval
• reindex
• render_search_template
• scripts_painless_execute
• scroll
• search
• search_application.delete
• search_application.delete_behavioral_analytics
• search_application.get
• search_application.get_behavioral_analytics
• search_application.list
• search_application.put
• search_application.put_behavioral_analytics
• search_application.search
• search_mvt
• search_template
• security.authenticate
• security.create_api_key
• security.get_api_key
• security.has_privileges
• security.invalidate_api_key
• security.query_api_keys
• sql.clear_cursor
• sql.delete_async
• sql.get_async
• sql.get_async_status
• sql.query
• sql.translate
• synonyms.delete_synonym
• synonyms.delete_synonym_rule
• synonyms.get_synonym
• synonyms.get_synonym_rule
• synonyms.get_synonyms_sets
• synonyms.put_synonym
• synonyms.put_synonym_rule
• terms_enum
• termvectors
• transform.delete_transform
• transform.get_transform
• transform.get_transform_stats
• transform.preview_transform
• transform.put_transform
• transform.reset_transform
• transform.schedule_now_transform
• transform.start_transform
• transform.stop_transform
• transform.update_transform
• update
• update_by_query

Set as public in elasticsearch-specification but not working:

• cluster.get_settings
• cluster.put_settings
• cluster.pending_tasks
• cluster.stats
• indices.put_template
• tasks.get
• security.update_api_key - It's "available" but if I understand correctly, you can't update an API key if you're authenticated with an API key.

[picandocodigo]

Closing this as done, but also we'll get an automated report when #36 gets merged.