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[DOCS] Add more examples to Painless statements (#48397)

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Add more examples to the Painless statements documentation (including while and do...while) as requested in #47485 (review)
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renshuki 2020-05-12 00:17:14 +09:00 committed by Jack Conradson
parent 8e96e5c936
commit b90c7e3797
1 changed files with 28 additions and 2 deletions
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30
docs/painless/painless-lang-spec/painless-statements.asciidoc
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@ -12,6 +12,8 @@ control flow statements] except the `switch` statement.
---------------------------------------------------------
if (doc[item].size() == 0) {
// do something if "item" is missing
} else if (doc[item].value == 'something') {
// do something if "item" value is: something
} else {
// do something else
}
@ -21,11 +23,35 @@ if (doc[item].size() == 0) {
===== For
Painless also supports the `for in` syntax from Groovy:
Painless also supports the `for in` syntax:
[source,painless]
---------------------------------------------------------
for (def item : list) {
...
// do something
}
---------------------------------------------------------
[source,painless]
---------------------------------------------------------
for (item in list) {
// do something
}
---------------------------------------------------------
===== While
[source,painless]
---------------------------------------------------------
while (ctx._source.item < condition) {
// do something
}
---------------------------------------------------------
===== Do-While
[source,painless]
---------------------------------------------------------
do {
// do something
}
while (ctx._source.item < condition)
---------------------------------------------------------