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FDAEMON_E_WORDLISTCOMMITFAILED
The word list could not be committed for querying
FDAEMON_E_WORDLISTCOMMITFAILED is the failure HRESULT 0x80041686 (-2147215738 signed; 2147751558 unsigned). Its severity bit is 1, facility is 4 (FACILITY_ITF), and code is 0x1686. AllStat describes it as “Commit of wordlist failed. Data not available for query.”
Interpretation
This result belongs to legacy Windows content indexing and is returned while publishing newly extracted terms from an indexing batch into query-visible catalog structures. The exact condition is: storage, transaction, merge or catalog-generation failure prevents the word list from becoming available to queries. This stage matters because converting the result to a generic COM failure removes the information needed to choose the owner and retry policy.
This value belongs to the legacy filter daemon and content-indexing pipeline. It identifies failure while extracting or committing indexed content, so query syntax changes do not repair it. Preserve the document, filter handler and catalog generation that owned the work item. Current IFilter documentation clarifies handler extraction contracts, while the daemon HRESULT remains tied to the legacy content-indexing pipeline and its catalog generation.
Concrete sources
- an incomplete word-list batch ID hides the distinction needed to separate this HRESULT from a later catalog or service failure.
- changes in commit phase between validation and execution can reproduce the result even when the user-visible input looks unchanged.
- Retrying this result with the same partition generation leaves the decisive contract violation intact.
- This result can appear when free space and I/O status disagrees with the state expected while publishing newly extracted terms from an indexing batch into query-visible catalog structures.
- a stale or transformed query-visible generation can make the component observe that storage, transaction, merge or catalog-generation failure prevents the word list from becoming available to queries.
The strongest hypothesis for it must account for the operation—publishing newly extracted terms from an indexing batch into query-visible catalog structures—and the documented condition. An unindexed document is only the outcome; it does not identify the handler, resource, partition generation, change list or word-list stage that failed.
Observability checklist
- compare failing and known-good values for word-list batch ID under the same provider or handler version.
- record the source and normalization path of commit phase, not only its display form.
- use partition generation to test whether the failure belongs to parsing, execution, indexing or capability negotiation.
- preserve free space and I/O status before objects or work items are released.
- associate query-visible generation with the exact UTC timestamp and correlation identifier.
- compare failing and known-good values for document identity and type under the same provider or handler version.
Evidence for it should reflect what the component actually received. Hash document content while retaining file type, size, handler CLSID, extraction stage, block counts and catalog generation.
Investigation order
- Capture word-list batch ID and commit phase at the call boundary that returns this result.
- confirm the operation reached publishing newly extracted terms from an indexing batch into query-visible catalog structures with the intended partition generation.
- perform the decisive check: record batch identity, target partition, commit phase, storage status and whether prior query-visible data remains valid.
- reduce the case until changing free space and I/O status alone changes the HRESULT or proves it irrelevant.
- apply the recovery only after verifying query-visible generation; preserve the original result for comparison.
A useful control for it changes one dimension at a time. Run a copied document through the same filter version in an isolated queue and compare the exact extraction or commit stage with a known-good document type.
Corrective action
Restore catalog storage consistency and replay the affected batch; do not report the new content as searchable before commit succeeds. Retry it only after the responsible input or state changes and the previous operation has completed or been cancelled. Retry only after resource pressure, handler behavior, work generation or catalog storage state changes and stale work is discarded.
What must not be inferred
It does not prove that all documents or all filters are affected; preserve the triggering work item, handler and catalog generation before broad recovery. Without code-specific evidence for it, the value also cannot identify which wrapper, configuration, handler or service transition introduced the condition.
Neighboring status codes
FDAEMON_E_NOWORDLIST means no word list is being built, while this value says a commit was attempted and failed. Keep the symbolic HRESULT beside the stage name in telemetry because nearby constants may require different owners, user messages and retry rules despite the same visible symptom.
Developer and administrator guidance
Retain the document identity, filter CLSID/version/bitness, daemon event, catalog generation and retry or quarantine history. Do not log credentials or unrestricted document content. Before rebuilding catalogs or reregistering every filter for it, isolate the document, handler and failed work generation.
Reproduction example
A disk error interrupts word-list publication. Monitoring keeps the previous generation online, repairs storage and replays only the failed indexing batch. A regression test for it should assert the decisive evidence, change only the responsible condition, and include one neighboring HRESULT so future code cannot collapse distinct failures into a generic message.
Official Microsoft references
- Microsoft: content-indexing values
- Microsoft: IFilter interface
- Microsoft: filter handlers
- Microsoft: HRESULT values
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