Add Elasticsearch notification

Elsasticsearch notification: add test cases

Elasticsearch notification: make timeout configurable

Elsasticsearch notification: add @timestamp field to JSON data

Elsasticsearch notification: improve error handling

use context.WithTimeoutCause

Co-authored-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

better comment the elaticsearch api endpoint

add screenshot to documentation

internal/model/notif_elasticsearch.go

@@ -0,0 +1,39 @@
+package model
+
+import (
+	"time"
+
+	"github.com/crazy-max/diun/v4/pkg/utl"
+)
+
+type NotifElasticsearch struct {
+	Scheme             string         `yaml:"scheme,omitempty" json:"scheme,omitempty" validate:"required,oneof=http https"`
+	Host               string         `yaml:"host,omitempty" json:"host,omitempty" validate:"required"`
+	Port               int            `yaml:"port,omitempty" json:"port,omitempty" validate:"required,min=1"`
+	Username           string         `yaml:"username,omitempty" json:"username,omitempty" validate:"omitempty"`
+	UsernameFile       string         `yaml:"usernameFile,omitempty" json:"usernameFile,omitempty" validate:"omitempty,file"`
+	Password           string         `yaml:"password,omitempty" json:"password,omitempty" validate:"omitempty"`
+	PasswordFile       string         `yaml:"passwordFile,omitempty" json:"passwordFile,omitempty" validate:"omitempty,file"`
+	Client             string         `yaml:"client,omitempty" json:"client,omitempty" validate:"required"`
+	Index              string         `yaml:"index,omitempty" json:"index,omitempty" validate:"required"`
+	Timeout            *time.Duration `yaml:"timeout,omitempty" json:"timeout,omitempty" validate:"required"`
+	InsecureSkipVerify bool           `yaml:"insecureSkipVerify,omitempty" json:"insecureSkipVerify,omitempty" validate:"omitempty"`
+}
+
+// GetDefaults gets the default values
+func (s *NotifElasticsearch) GetDefaults() *NotifElasticsearch {
+	n := &NotifElasticsearch{}
+	n.SetDefaults()
+	return n
+}
+
+// SetDefaults sets the default values
+func (s *NotifElasticsearch) SetDefaults() {
+	s.Scheme = "http"
+	s.Host = "localhost"
+	s.Port = 9200
+	s.Client = "diun"
+	s.Index = "diun-notifications"
+	s.Timeout = utl.NewDuration(10 * time.Second)
+	s.InsecureSkipVerify = false
+}