[9.0] ESQL: Fix sneaky bug in single value query (#127146) #127178
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Fixes a sneaky bug in single value query that happens when run against
a `keyword` field that:
* Is defined on every field
* Contains the same number of distinct values as documents
The simplest way to reproduce this is to build a single shard index
with two documents:
```
{"a": "foo"}
{"a": ["foo", "bar"]}
```
I don't think this is particularly likely in production, but it's quite
likely in tests. Which is where I hit this - in the serverless tests we
index an index with four documents into three shards and two of the
documents look just like this. So about 1/3 or the time we triggered
this bug.
Mechanically this is triggered by the `SingleValueMatchQuery`
incorrectly rewriting itself to `MatchAll` in the scenario above. This
fixes that.
nik9000
added
:Analytics/ES|QL
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Backports the following commits to 9.0: