rinkako created FLINK-18432:
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Summary: add open and close methods for ElasticsearchSinkFunction
interface
Key: FLINK-18432
URL: https://issues.apache.org/jira/browse/FLINK-18432
Project: Flink
Issue Type: Improvement
Components: Connectors / ElasticSearch
Reporter: rinkako
Here comes a example story: we want to sink data to ES with a day-rolling index
name, by using `DateTimeFormatter` and `ZonedDateTime` for generating a
day-rolling postfix to add to the index pattern of `return
Requests.indexRequest().index("mydoc_"+postfix)` in a custom
`ElasticsearchSinkFunction`. Here `DateTimeFormatter` is not a serializable
class and must be a transient field of this `ElasticsearchSinkFunction`, and it
must be checked null every time we call `process` (since the field is
transient, it may be null at a distributed task manager), which can be done at
a `open` method only run once.
So it seems that add `open` and `close` method of `ElasticsearchSinkFunction`
interface can handle this well, users can control their sink function
life-cycle more flexiblely. And, for compatibility, this two methods may have a
empty default implementation at `ElasticsearchSinkFunction` interface.
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