Fix the incorrect keys of the es output plugin

[dkeven]

Signed-off-by: dkeven [email protected]

When generating params from the Elasticsearch type, in:

https://github.com/fluent/fluentbit-operator/blob/4b96fcc0a7e19a5bb89f7051982d7bcee538b2a2/api/fluentbitoperator/v1alpha2/plugins/output/elasticsearch_types.go#L155-L159

,the config keys of the Type and Index fields are incorrectly set to Host if they are not empty, resulting in an overwriting of the true Host config, like in this issue: kubesphere/kubesphere#4395

[dkeven]

/cc @wenchajun @benjaminhuo @wanjunlei

[wenchajun]

/lgtm

[benjaminhuo]

@dkeven Good catch, thanks!