Revert "pipelines: filters: parser: Add a nest_under parameter"

Author: lockewritesdocs

pipeline/filters/parser.md

@@ -12,7 +12,6 @@ The plugin supports the following configuration parameters:
 | Parser | Specify the parser name to interpret the field. Multiple _Parser_ entries are allowed \(one per line\). |  |
 | Preserve\_Key | Keep original `Key_Name` field in the parsed result. If false, the field will be removed. | False |
 | Reserve\_Data | Keep all other original fields in the parsed result. If false, all other original fields will be removed. | False |
-| Nest\_Under | Specify the name of the field to nest parsed records under. |  |
 
 ## Getting Started
 
@@ -157,42 +156,3 @@ Fluent Bit v2.1.1
 [0] dummy.data: [[1687122779.296906553, {}], {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example", "data"=>"100 0.5 true This is example", "key1"=>"value1", "key2"=>"value2"}]
 [0] dummy.data: [[1687122780.297475803, {}], {"INT"=>"100", "FLOAT"=>"0.5", "BOOL"=>"true", "STRING"=>"This is example", "data"=>"100 0.5 true This is example", "key1"=>"value1", "key2"=>"value2"}]
 ```
-
-### Nest parsed fields
-
-Instead of expanding parsed fields at the root of the object,
-you can nest them under a new field defined by `Nest_Under`:
-
-```python copy
-[SERVICE]
-    Parsers_File /fluent-bit/etc/parsers.conf
-
-[INPUT]
-    Name  Dummy
-    Dummy {"log":"error: my error","element":"{\"a\":\"b\",\"c\":{\"x\":\"y\"}}"}
-    Tag   dummy.data
-
-[FILTER]
-    Name parser
-    Match dummy.*
-    Parser json
-    Key_Name element
-    Nest_Under parsed
-
-[OUTPUT]
-    Name stdout
-    Match *
-```
-
-This configuration results in the following output:
-
-```text
-$ fluent-bit -c dummy.conf
-Fluent Bit v2.1.1
-* Copyright (C) 2015-2022 The Fluent Bit Authors
-...
-...
-[0] dummy.data: [[1736759501.208000317, {}], {"parsed"=>{"a"=>"b", "c"=>{"x"=>"y"}}}]
-[0] dummy.data: [[1736759502.207935361, {}], {"parsed"=>{"a"=>"b", "c"=>{"x"=>"y"}}}]
-[0] dummy.data: [[1736759503.207765898, {}], {"parsed"=>{"a"=>"b", "c"=>{"x"=>"y"}}}]
-```