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This change adds `access` format support for notifications to a Elasticsearch server, and it refactors `namespace` format support. In the case of `access` format, for each event in Minio, a JSON document is inserted into Elasticsearch with its timestamp set to the event's timestamp, and with the ID generated automatically by elasticsearch. No events are modified or deleted in this mode. In the case of `namespace` format, for each event in Minio, a JSON document is keyed together by the bucket and object name is updated in Elasticsearch. In the case of an object being created or over-written in Minio, a new document or an existing document is inserted into the Elasticsearch index. If an object is deleted in Minio, the corresponding document is deleted from the Elasticsearch index. Additionally, this change upgrades Elasticsearch support to the 5.x series. This is a breaking change, and users of previous elasticsearch versions should upgrade. Also updates documentation on Elasticsearch notification target usage and has a link to an elasticsearch upgrade guide. This is the last patch that finally resolves #3928.
196 lines
7.6 KiB
Markdown
196 lines
7.6 KiB
Markdown
# Changes in Elastic 5.0
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## Enforce context.Context in PerformRequest and Do
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We enforce the usage of `context.Context` everywhere you execute a request.
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You need to change all your `Do()` calls to pass a context: `Do(ctx)`.
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This enables automatic request cancelation and many other patterns.
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If you don't need this, simply pass `context.TODO()` or `context.Background()`.
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## Warmers removed
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Warmers are no longer necessary and have been [removed in ES 5.0](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_index_apis.html#_warmers).
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## Optimize removed
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Optimize was deprecated in ES 2.0 and has been [removed in ES 5.0](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_rest_api_changes.html#_literal__optimize_literal_endpoint_removed).
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Use [Force Merge](https://www.elastic.co/guide/en/elasticsearch/reference/master/indices-forcemerge.html) instead.
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## Missing Query removed
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The `missing` query has been [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/query-dsl-exists-query.html#_literal_missing_literal_query).
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Use `exists` query with `must_not` in `bool` query instead.
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## And Query removed
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The `and` query has been [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_search_changes.html#_deprecated_queries_removed).
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Use `must` clauses in a `bool` query instead.
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## Not Query removed
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TODO Is it removed?
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## Or Query removed
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The `or` query has been [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_search_changes.html#_deprecated_queries_removed).
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Use `should` clauses in a `bool` query instead.
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## Filtered Query removed
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The `filtered` query has been [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_search_changes.html#_deprecated_queries_removed).
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Use `bool` query instead, which supports `filter` clauses too.
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## Limit Query removed
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The `limit` query has been [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_search_changes.html#_deprecated_queries_removed).
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Use the `terminate_after` parameter instead.
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# Template Query removed
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The `template` query has been [deprecated](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/query-dsl-template-query.html). You should use
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Search Templates instead.
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We remove it from Elastic 5.0 as the 5.0 update is already a good opportunity
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to get rid of old stuff.
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## `_timestamp` and `_ttl` removed
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Both of these fields were deprecated and are now [removed](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_mapping_changes.html#_literal__timestamp_literal_and_literal__ttl_literal).
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## Search template Put/Delete API returns `acknowledged` only
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The response type for Put/Delete search templates has changed.
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It only returns a single `acknowledged` flag now.
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## Fields has been renamed to Stored Fields
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The `fields` parameter has been renamed to `stored_fields`.
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See [here](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/breaking_50_search_changes.html#_literal_fields_literal_parameter).
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## Fielddatafields has been renamed to Docvaluefields
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The `fielddata_fields` parameter [has been renamed](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/breaking_50_search_changes.html#_literal_fielddata_fields_literal_parameter)
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to `docvalue_fields`.
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## Type exists endpoint changed
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The endpoint for checking whether a type exists has been changed from
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`HEAD {index}/{type}` to `HEAD {index}/_mapping/{type}`.
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See [here](https://www.elastic.co/guide/en/elasticsearch/reference/5.0/breaking_50_rest_api_changes.html#_literal_head_index_type_literal_replaced_with_literal_head_index__mapping_type_literal).
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## Refresh parameter changed
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The `?refresh` parameter previously could be a boolean value. It indicated
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whether changes made by a request (e.g. by the Bulk API) should be immediately
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visible in search, or not. Using `refresh=true` had the positive effect of
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immediately seeing the changes when searching; the negative effect is that
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it is a rather big performance hit.
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With 5.0, you now have the choice between these 3 values.
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* `"true"` - Refresh immediately
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* `"false"` - Do not refresh (the default value)
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* `"wait_for"` - Wait until ES made the document visible in search
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See [?refresh](https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-refresh.html) in the documentation.
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Notice that `true` and `false` (the boolean values) are no longer available
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now in Elastic. You must use a string instead, with one of the above values.
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## ReindexerService removed
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The `ReindexerService` was a custom solution that was started in the ES 1.x era
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to automate reindexing data, from one index to another or even between clusters.
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ES 2.3 introduced its own [Reindex API](https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-reindex.html)
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so we're going to remove our custom solution and ask you to use the native reindexer.
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The `ReindexService` is available via `client.Reindex()` (which used to point
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to the custom reindexer).
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## Delete By Query back in core
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The [Delete By Query API](https://www.elastic.co/guide/en/elasticsearch/reference/master/docs-delete-by-query.html)
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was moved into a plugin in 2.0. Now its back in core with a complete rewrite based on the Bulk API.
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It has it's own endpoint at `/_delete_by_query`.
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Delete By Query, Reindex, and Update By Query are very similar under the hood.
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## Reindex, Delete By Query, and Update By Query response changed
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The response from the above APIs changed a bit. E.g. the `retries` value
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used to be an `int64` and returns separate values for `bulk` and `search` now:
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```
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// Old
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{
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...
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"retries": 123,
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...
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}
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```
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```
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// New
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{
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...
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"retries": {
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"bulk": 123,
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"search": 0
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},
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...
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}
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```
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## ScanService removed
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The `ScanService` is removed. Use the (new) `ScrollService` instead.
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## New ScrollService
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There was confusion around `ScanService` and `ScrollService` doing basically
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the same. One was returning slices and didn't support all query details, the
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other returned one document after another and wasn't safe for concurrent use.
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So we merged the two and merged it into a new `ScrollService` that
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removes all the problems with the older services.
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In other words:
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If you used `ScanService`, switch to `ScrollService`.
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If you used the old `ScrollService`, you might need to fix some things but
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overall it should just work.
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Changes:
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- We replaced `elastic.EOS` with `io.EOF` to indicate the "end of scroll".
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TODO Not implemented yet
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## Suggesters
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They have been [completely rewritten in ES 5.0](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_suggester.html).
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Some changes:
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- Suggesters no longer have an [output](https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking_50_suggester.html#_simpler_completion_indexing).
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TODO Fix all structural changes in suggesters
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## Percolator
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Percolator has [changed considerably](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/breaking_50_percolator.html).
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Elastic 5.0 adds the new
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[Percolator Query](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/query-dsl-percolate-query.html)
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which can be used in combination with the new
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[Percolator type](https://www.elastic.co/guide/en/elasticsearch/reference/5.x/percolator.html).
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The Percolate service is removed from Elastic 5.0.
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## Remove Consistency, add WaitForActiveShards
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The `consistency` parameter has been removed in a lot of places, e.g. the Bulk,
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Index, Delete, Delete-by-Query, Reindex, Update, and Update-by-Query API.
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It has been replaced by a somewhat similar `wait_for_active_shards` parameter.
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See https://github.com/elastic/elasticsearch/pull/19454.
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