[ENG-6708] IndexStrategy revamp (more than one index per strategy, wow)

[aaxelb]

revamp IndexStrategy to allow multiple indexes as part of a single coherent strategy -- this better allows common elasticsearch optimizations, like distinct indexes mapped for different kinds of queries

(recommend hiding whitespace changes from diff, especially for changes to existing strategies)

• simplify existing classes by making them dataclasses (with additional fields) -- an IndexStrategy instance knows its checksum (which may be non-current) and may have multiple SpecificIndex

  • IndexStrategy -- each instance represents a current or past version of the strategy, identified by checksum
    • strategy_name (rename existing name field for disambig)
    • strategy_check (new field; default hexdigest from CURRENT_STRATEGY_CHECKSUM but may be parsed from or index name or indexStrategy query param)
  • IndexStrategy.SpecificIndex -- each instance represents a specific index that belongs to a strategy instance and may or may not exist
    • index_strategy (existing field)
    • subname (new field; unique within a strategy)

• remove uniindex methods from IndexStrategy (and friends)

  • each_specific_index
  • for_specific_index
  • for_current_index
  • SpecificIndex.pls_setup
  • SpecificIndex.pls_handle_cardsearch
  • SpecificIndex.pls_handle_valuesearch
  • Elastic8IndexStrategy.index_settings
  • Elastic8IndexStrategy.index_mappings

• add replacement multiindex methods to IndexStrategy (and friends)

  • (classmethod) each_existing_index (based on index names from elastic; may be any hex)
  • each_subnamed_index (includes non-existent)
  • get_index
  • index_subname_set (each index has a subname that's unique within the strategy)
  • is_current
  • pls_setup
  • pls_check_exists
  • pls_start_keeping_live
  • is_kept_live
  • pls_teardown
  • pls_handle_cardsearch
  • pls_handle_valuesearch
  • pls_refresh
  • pls_get_strategy_status (includes index statuses)
  • with_strategy_check (return copy of the strategy with another check)
  • Elastic8IndexStrategy.define_current_indexes (abstractmethod)
  • Elastic8IndexStrategy.each_subnamed_index (based on current_index_definitions)

• update existing IndexStrategy base methods

  • add strategy_check to indexname_prefix
  • pls_get_default_for_searching (get strategy_check from es alias (or current))
  • pls_make_default_for_searching (by strategy instance (or strategy_check), not SpecificIndex)

• update share.search.index_strategy public interface (see all)

• update the "elasticsearch indexes" admin view to list multiple

• update trovesearch_denorm strategy, split its one index into two ("cards" and "iri_values")

ENG-6708

[coveralls]

coverage: 91.738% (-0.004%) from 91.742%
when pulling 2d267eb on aaxelb:feat/multiple-current-indexes
into c953024 on CenterForOpenScience:develop.

[aaxelb]

(comments from group review)

[felliott]

LGTM! We reviewed over zoom, all requested changes made!

[felliott]

Looks good!

[aaxelb]

(merging despite the drop in test coverage, intending to follow up with more tests)