// Supporter provides index management and configuration related services
// throughout libbeat.
// The BuildSelector is used by the output to create an IndexSelector. The
// index selector will report the per event index name to be used.
// A manager instantiated via Supporter is responsible for instantiating/configuring
// the index throughout the Elastic Stack.
type Supporter interface {
	// Enalbed checks if index management is configured to configure templates,
	// ILM, or aliases.
	Enabled() bool

	// ILM provides access to the configured ILM support.
	ILM() ilm.Supporter

	// TemplateConfig returns the template configuration used by the index supporter.
	TemplateConfig(withILM bool) (template.TemplateConfig, error)

	// BuildSelector create an index selector.
	// The defaultIndex string is interpreted as format string. It is used
	// as default index if the configuration provided does not define an index or
	// has no default fallback if all indices are guarded by conditionals.
	BuildSelector(cfg *common.Config) (outputs.IndexSelector, error)

	// Manager creates a new manager that can be used to execute the required steps
	// for initializing an index, ILM policies, and write aliases.
	Manager(client ESClient, assets Asseter) Manager
}

// Supporter implements ILM support. For loading the policies and creating
// write alias a manager instance must be generated.
type Supporter interface {
	Mode() Mode
	Alias() Alias
	Policy() Policy
	Manager(h APIHandler) Manager
}

// Manager uses an APIHandler to install a policy.
type Manager interface {
	Enabled() (bool, error)

	EnsureAlias() error

	// EnsurePolicy installs a policy if it does not exist. The policy is always
	// written if overwrite is set.
	// The created flag is set to true only if a new policy is created. `created`
	// is false if an existing policy gets overwritten.
	EnsurePolicy(overwrite bool) (created bool, err error)
}

	// ILM provides access to the configured ILM support.
	ILM() ilm.Supporter

	// TemplateConfig returns the template configuration used by the index supporter.
	TemplateConfig(withILM bool) (template.TemplateConfig, error)