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02138dc70a
Synthetic _source's array flattening activities can remove some arrays
entirely. Specifically:
```
{
"foo": [
{
"bar": 1
},
{
"baz": 2
}
]
}
```
Turns into:
```
{
"foo": {
"bar": 1,
"baz": 2
}
}
```
See, no more array! It's because the values are flattend to the leaf
fields and didn't have multiple values. This is implied by the docs we
had, but sure wasn't obvious. So now it's documented specifically.
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|---|---|---|
| .. | ||
| doc-count-field.asciidoc | ||
| field-names-field.asciidoc | ||
| id-field.asciidoc | ||
| ignored-field.asciidoc | ||
| index-field.asciidoc | ||
| meta-field.asciidoc | ||
| routing-field.asciidoc | ||
| source-field.asciidoc | ||
| synthetic-source.asciidoc | ||
| tier-field.asciidoc | ||