index
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string | string[] - A comma-separated list of index names; use _all or empty string to perform the operation on all indices
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allow_no_indices or allowNoIndices
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boolean - Whether to ignore if a wildcard indices expression resolves into no concrete indices. (This includes _all string or when no indices have been specified)
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expand_wildcards or expandWildcards
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'open' | 'closed' | 'none' | 'all' - Whether to expand wildcard expression to concrete indices that are open, closed or both.
Default: open
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ignore_unavailable or ignoreUnavailable
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boolean - Whether specified concrete indices should be ignored when unavailable (missing or closed)
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wait_for_completion or waitForCompletion
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boolean - Specify whether the request should block until the all segments are upgraded (default: false)
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only_ancient_segments or onlyAncientSegments
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boolean - If true, only ancient (an older Lucene major release) segments will be upgraded
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