What does HRESULT 0x00041685 (FDAEMON_W_EMPTYWORDLIST) mean?

FDAEMON_W_EMPTYWORDLIST

Filter daemon produced an empty word list

FDAEMON_W_EMPTYWORDLIST is HRESULT 267909 (0x00041685) from Indexing Service. AllStat describes it as “Final wordlist was empty.” The severity bit indicates a nonfailure result, but the value carries a specific condition that must not be collapsed into plain S_OK.

In the legacy Indexing Service or IFilter pipeline, FDAEMON_W_EMPTYWORDLIST means that final wordlist was empty. The high-level request can be considered complete after FDAEMON_W_EMPTYWORDLIST only when its documented postcondition has been checked.

Where the status is encountered

• FDAEMON_W_EMPTYWORDLIST can be returned during legacy Indexing Service catalog processing; log the exact method and object state instead of interpreting the constant outside that contract.
• FDAEMON_W_EMPTYWORDLIST can be returned during IFilter text and property extraction; log the exact method and object state instead of interpreting the constant outside that contract.
• FDAEMON_W_EMPTYWORDLIST can be returned during search enumeration, scan scheduling, or catalog administration; log the exact method and object state instead of interpreting the constant outside that contract.

Because FDAEMON_W_EMPTYWORDLIST is informational, a language binding may expose it as success and hide the symbolic distinction. Keep the original HRESULT available until the code-specific branch has run.

Evidence and telemetry

• For FDAEMON_W_EMPTYWORDLIST, preserve document type and byte length.
• For FDAEMON_W_EMPTYWORDLIST, preserve filter CLSID.
• For FDAEMON_W_EMPTYWORDLIST, preserve language identifier.
• For FDAEMON_W_EMPTYWORDLIST, preserve word-breaker and noise-word configuration.
• For FDAEMON_W_EMPTYWORDLIST, preserve token counts before and after filtering.

Also record fdaemon_w_emptywordlist_operation, fdaemon_w_emptywordlist_state_before, fdaemon_w_emptywordlist_state_after, UTC time, process and thread identifiers, component version, and a correlation ID. For FDAEMON_W_EMPTYWORDLIST, protect user data in logs and keep only the identifiers required to reproduce component state.

What must be true before accepting it

For FDAEMON_W_EMPTYWORDLIST, verify that the document or query legitimately contains no indexable tokens after filtering, language analysis, and stop-word processing. The verification prevents FDAEMON_W_EMPTYWORDLIST from being promoted to broader success than the producing API promised.

The component may have changed durable or in-memory state before returning FDAEMON_W_EMPTYWORDLIST; inspect that state first.

Correct handling and recovery

Preserve the source and language configuration, then determine whether empty output is expected. Fix filter loading, encoding, or word-breaker selection only when the input should contain searchable terms.

Retry FDAEMON_W_EMPTYWORDLIST only when a documented input or state has changed. For FDAEMON_W_EMPTYWORDLIST, retry policy must follow the owning state machine rather than a generic transient-error loop.

Diagnostic sequence

• Capture the raw value 0x00041685 before wrappers, signed-decimal formatting, exceptions, or generic success handling replace FDAEMON_W_EMPTYWORDLIST.
• Identify the operation that returned FDAEMON_W_EMPTYWORDLIST, including interface or callback, component build, thread, process, and the state-machine phase.
• For FDAEMON_W_EMPTYWORDLIST, prove the decisive condition: the document or query legitimately contains no indexable tokens after filtering, language analysis, and stop-word processing.
• Inspect every output, count, status array, buffer, callback, task state, media timestamp, transaction vote, or security token that remains part of the FDAEMON_W_EMPTYWORDLIST contract.
• Compare state immediately before and after FDAEMON_W_EMPTYWORDLIST; success severity does not guarantee that optional work or the caller’s intended high-level action completed.
• Reproduce FDAEMON_W_EMPTYWORDLIST with the smallest input that retains the same condition, then alter only the recorded cause before repeating the operation.

Difference from nearby results

FDAEMON_W_EMPTYWORDLIST must be distinguished from ordinary S_OK and from failure-severity values in the same API family; its documented state changes control the next action.

For FDAEMON_W_EMPTYWORDLIST, the nearby-status comparison controls whether outputs are usable and whether more work is expected.

Developer and administrator guidance

Code should branch on FDAEMON_W_EMPTYWORDLIST before a generic SUCCEEDED(hr) path whenever outputs, continuation, cancellation, or recovery differ. Telemetry should retain FDAEMON_W_EMPTYWORDLIST, 0x00041685, the producing method, and a correlation ID.

For FDAEMON_W_EMPTYWORDLIST, document ownership of retry, cancellation, cleanup, and user messaging. Operational remediation of FDAEMON_W_EMPTYWORDLIST belongs to the producing provider, service, pipeline, or security package.

Practical scenario

A document containing only punctuation and stop words produces an empty final word list. The indexer records the language and accepts the empty result rather than retrying the same filter.

A regression test should reproduce FDAEMON_W_EMPTYWORDLIST, assert the relevant outputs and state, then change only the decisive condition and verify the expected neighboring result or ordinary completion.

References

• Microsoft: Filter interface values — official Microsoft material used to interpret FDAEMON_W_EMPTYWORDLIST.
• Microsoft: About Indexing Service filters — official Microsoft material used to interpret FDAEMON_W_EMPTYWORDLIST.
• Microsoft: Using custom filters — official Microsoft material used to interpret FDAEMON_W_EMPTYWORDLIST.
• Microsoft: HRESULT values — official Microsoft material used to interpret FDAEMON_W_EMPTYWORDLIST.

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