57 lines
2.6 KiB
Plaintext
57 lines
2.6 KiB
Plaintext
[[query-dsl-minimum-should-match]]
|
|
== `minimum_should_match` parameter
|
|
|
|
The `minimum_should_match` parameter possible values:
|
|
|
|
[cols="<,<,<",options="header",]
|
|
|=======================================================================
|
|
|Type |Example |Description
|
|
|Integer |`3` |Indicates a fixed value regardless of the number of
|
|
optional clauses.
|
|
|
|
|Negative integer |`-2` |Indicates that the total number of optional
|
|
clauses, minus this number should be mandatory.
|
|
|
|
|Percentage |`75%` |Indicates that this percent of the total number of
|
|
optional clauses are necessary. The number computed from the percentage
|
|
is rounded down and used as the minimum.
|
|
|
|
|Negative percentage |`-25%` |Indicates that this percent of the total
|
|
number of optional clauses can be missing. The number computed from the
|
|
percentage is rounded down, before being subtracted from the total to
|
|
determine the minimum.
|
|
|
|
|Combination |`3<90%` |A positive integer, followed by the less-than
|
|
symbol, followed by any of the previously mentioned specifiers is a
|
|
conditional specification. It indicates that if the number of optional
|
|
clauses is equal to (or less than) the integer, they are all required,
|
|
but if it's greater than the integer, the specification applies. In this
|
|
example: if there are 1 to 3 clauses they are all required, but for 4 or
|
|
more clauses only 90% are required.
|
|
|
|
|Multiple combinations |`2<-25% 9<-3` |Multiple conditional
|
|
specifications can be separated by spaces, each one only being valid for
|
|
numbers greater than the one before it. In this example: if there are 1
|
|
or 2 clauses both are required, if there are 3-9 clauses all but 25% are
|
|
required, and if there are more than 9 clauses, all but three are
|
|
required.
|
|
|=======================================================================
|
|
|
|
*NOTE:*
|
|
|
|
When dealing with percentages, negative values can be used to get
|
|
different behavior in edge cases. 75% and -25% mean the same thing when
|
|
dealing with 4 clauses, but when dealing with 5 clauses 75% means 3 are
|
|
required, but -25% means 4 are required.
|
|
|
|
If the calculations based on the specification determine that no
|
|
optional clauses are needed, the usual rules about BooleanQueries still
|
|
apply at search time (a BooleanQuery containing no required clauses must
|
|
still match at least one optional clause)
|
|
|
|
No matter what number the calculation arrives at, a value greater than
|
|
the number of optional clauses, or a value less than 1 will never be
|
|
used. (ie: no matter how low or how high the result of the calculation
|
|
result is, the minimum number of required matches will never be lower
|
|
than 1 or greater than the number of clauses.
|