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* Cover index_prefix_domain_map and index_suffix in index migrations (#868) The startup Elasticsearch/OpenSearch index migrations built their target index names from the [elasticsearch]/[opensearch] index_prefix and index_suffix options alone, while the save path also honors general.index_prefix_domain_map. A multi-tenant deployment therefore ran the backfill guard `count` against dmarc_aggregate*/smtp_tls*, patterns matching none of its real <tenant>_dmarc_aggregate-* indexes. The query passes allow_no_indices=True, so a zero-match wildcard returns count 0 -- indistinguishable from "already backfilled" -- and the backfill was skipped silently, with no log line at any level. Resolve migration index names through a new _migration_index_names() helper that widens both configurable axes: one name per tenant prefix in the map plus the unprefixed name (unmapped domains are still saved unprefixed), and, when an index_suffix is set, the unsuffixed name alongside the suffixed one so history predating the suffix is covered. A configured index_prefix still wins outright and suppresses the map fan-out, matching save-time precedence. The key normalization is now shared with get_index_prefix() via _normalize_index_prefix(), so the names parsedmarc migrates cannot drift from the ones it writes. The resolved lists are logged at DEBUG, and the SIGHUP reload path passes the freshly parsed map, so a newly onboarded tenant is covered without a restart. Also repair the legacy published_policy.fo migration, which has been unable to complete since mapping types were removed in Elasticsearch 7 (and never existed in OpenSearch): it read the field mapping in the type-keyed response shape, so the check always fell through, and its put_mapping() call passed a doc_type argument neither current client accepts. It now reads either response shape, uses each client's current signature, and takes its index names in a separate legacy_fo_indexes argument -- exact names, since 5.0.0 introduced date-suffixed index names in the same release that fixed the fo declaration, but prefixed and suffixed where configured, since both options date back to 4.1.0. Tenant prefixes are excluded: index_prefix_domain_map arrived in 8.19.0, and this migration renames the index it rebuilds. The Elasticsearch copy, removed as unreachable during the #806 client migration, is restored now that the cause is understood. Finally, reject an index_prefix_domain_map YAML file that is not a mapping of string tenant names to lists of domains, instead of raising mid-save on a non-string key or silently matching the wrong domains on a scalar value -- `in` on a str is a substring test, so "example.co" matches "example.com" (https://docs.python.org/3/reference/expressions.html#membership-test-operations). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * Fix OpenSearch capitalization and spacing in the usage docs Copilot review of #869: the `index_prefix_domain_map` option line spelled "OpenSearch" as "Opensearch" and had a doubled space before the type. Both predate this branch but sit inside a hunk it rewrites. Also wrapped the line to match the continuation-indent style of every other option in the list, and corrected the same misspelling in the multi-tenant section a few lines above the paragraph this branch added. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * Require index_prefix_domain_map domain lists to hold strings Copilot review of #869: the shape check verified that each value was a list but not what the list contained, so `tenant_a: [42]` passed and then never compared equal to any domain the save path looks up -- the same silent-misbehavior class the check exists to reject, and a contradiction of the "any other shape is rejected at startup" claim in the docs. Check the list's items too, and reword the error message, comment, CHANGELOG and docs to state the rule the check now enforces: a mapping of tenant names to lists of domain names, all strings. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> * Make the legacy fo migration retry-safe, and nest its mapping body Copilot review of #869, verified against live Elasticsearch 8.19 and OpenSearch 3 containers rather than mocks. Retry safety (a real defect): an attempt interrupted between creating the -v2 index and deleting the original left debris that made create() fail with "resource already exists" on every later startup, inside the same try that swallows the error -- so the index was never migrated and the debris document survived. Reproduced on a live cluster. Discard a leftover target first; that is safe precisely because reaching this point means the original still holds the data, since it is deleted only once the reindex has succeeded. Mapping body: the reviewer's concern that a dotted key under `properties` risks a runtime failure does not hold -- both clusters accept it and produce a byte-identical mapping, with the dot expanded into published_policy -> properties -> fo. Switch to the nested object form anyway, since dot expansion is conditional on the object's `subobjects` setting and this shape never is, and derive the object/leaf names from the dotted constant so the write cannot drift from the field the read looks up. Both fo-migration suites now build per-name Index mocks. A single shared mock cannot express "the original exists but its migration target does not", which is the ordinary case and the one the retry fix turns on; the happy path now also asserts the target index is never deleted. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>