Fix format issue for the split ingest processor documentation

Signed-off-by: gaobinlong <[email protected]>

_ingest-pipelines/processors/split.md

@@ -26,19 +26,18 @@ The following is the syntax for the `split` processor:
 
 The following table lists the required and optional parameters for the `split` processor.
 
-Parameter | Required/Optional | Description |
-|-----------|-----------|-----------|
-`field` | Required | The field containing the string to be split.
-`separator` | Required | The delimiter used to split the string. This can be a regular expression pattern.
-`preserve_field` | Optional | If set to `true`, preserves empty trailing fields (for example, `''`) in the resulting array. If set to `false`, empty trailing fields are removed from the resulting array. Default is `false`.
-`target_field` | Optional | The field where the array of substrings is stored. If not specified, then the field is updated in-place.
-`ignore_missing` | Optional	| Specifies whether the processor should ignore documents that do not contain the specified 
-field. If set to `true`, then the processor ignores missing values in the field and leaves the `target_field` unchanged. Default is `false`. 
-`description` | Optional | A brief description of the processor.
-`if` | Optional | A condition for running the processor.
-`ignore_failure` | Optional | Specifies whether the processor continues execution even if it encounters an error. If set to `true`, then failures are ignored. Default is `false`.
-`on_failure` | Optional | A list of processors to run if the processor fails.
-`tag` | Optional | An identifier tag for the processor. Useful for debugging in order to distinguish between processors of the same type.
+| Parameter  | Required/Optional  | Description  |
+|---|---|---|
+`field` | Required | The field containing the string to be split. |
+`separator` | Required | The delimiter used to split the string. This can be a regular expression pattern. |
+`preserve_field` | Optional | If set to `true`, preserves empty trailing fields (for example, `''`) in the resulting array. If set to `false`, empty trailing fields are removed from the resulting array. Default is `false`. |
+`target_field` | Optional | The field where the array of substrings is stored. If not specified, then the field is updated in-place. |
+`ignore_missing` | Optional	| Specifies whether the processor should ignore documents that do not contain the specified field. If set to `true`, then the processor ignores missing values in the field and leaves the `target_field` unchanged. Default is `false`.  |
+`description` | Optional | A brief description of the processor. |
+`if` | Optional | A condition for running the processor. |
+`ignore_failure` | Optional | Specifies whether the processor continues execution even if it encounters an error. If set to `true`, then failures are ignored. Default is `false`. |
+`on_failure` | Optional | A list of processors to run if the processor fails. |
+`tag` | Optional | An identifier tag for the processor. Useful for debugging in order to distinguish between processors of the same type. |
 
 ## Using the processor