Expose Logstash_Format param for ES Backend. (#16260)

Signed-off-by: Asher Foa <asher@asherfoa.com>

stable/fluent-bit/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: fluent-bit
-version: 2.6.0
+version: 2.7.0
 appVersion: 1.2.2
 description: Fast and Lightweight Log/Data Forwarder for Linux, BSD and OSX
 keywords:

stable/fluent-bit/README.md

@@ -44,6 +44,7 @@ The following table lists the configurable parameters of the Fluent-Bit chart an
 | `backend.es.index`         | Elastic Index name | `kubernetes_cluster` |
 | `backend.es.type`          | Elastic Type name | `flb_type` |
 | `backend.es.time_key`          | Elastic Time Key | `@timestamp` |
+| `backend.es.logstash_format`          | Enable Logstash format compatibility. | `On` |
 | `backend.es.logstash_prefix`  | Index Prefix. If Logstash_Prefix is equals to 'mydata' your index will become 'mydata-YYYY.MM.DD'. | `kubernetes_cluster` |
 | `backend.es.replace_dots`     | Enable/Disable Replace_Dots option. | `On` |
 | `backend.es.http_user`        | Optional username credential for Elastic X-Pack access. | `` |

stable/fluent-bit/templates/config.yaml

@@ -95,7 +95,7 @@ data:
         Match *
         Host  {{ .Values.backend.es.host }}
         Port  {{ .Values.backend.es.port }}
-        Logstash_Format On
+        Logstash_Format {{ default "On" .Values.backend.es.logstash_format  }}
         Retry_Limit False
         Type  {{ .Values.backend.es.type }}
 {{- if .Values.backend.es.time_key }}

stable/fluent-bit/values.yaml

@@ -59,6 +59,7 @@ backend:
     type: flb_type
     logstash_prefix: kubernetes_cluster
     replace_dots: "On"
+    logstash_format: "On"
     time_key: "@timestamp"
     # Optional username credential for Elastic X-Pack access
     http_user: