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A `wildcard` field stores values optimised for wildcard grep-like queries.
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A `wildcard` field stores values optimised for wildcard grep-like queries.
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Wildcard queries are possible on other field types but suffer from constraints:
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Wildcard queries are possible on other field types but suffer from constraints:
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* `text` fields limit matching of any wildcard expressions to individual tokens rather than the original whole value held in a field
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* `text` fields limit matching of any wildcard expressions to individual tokens rather than the original whole value held in a field
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* `keyword` fields are untokenized but slow at performing wildcard queries (especially patterns with leading wildcards).
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* `keyword` fields are untokenized but slow at performing wildcard queries (especially patterns with leading wildcards).
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