BasicUsageExample: ArtifactInfo may be null #393
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`IndexUtils.constructArtifactInfo(doc, centralContext)` may return null, for example deleted artifacts. Also `IndexReader.document(int)` is deprecated, use `.storedFields()` to retrieve document. Signed-off-by: 司芳源 <[email protected]>
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IndexUtils.constructArtifactInfo(doc, centralContext)may return null, for example deleted artifacts and theDefaultIndexingContextdocument.Also
IndexReader.document(int)is deprecated, use.storedFields()to retrieve document.