Issue search support elasticsearch (#9428 )

* Issue search support elasticsearch

* Fix lint

* Add indexer name on app.ini

* add a warnning on SearchIssuesByKeyword

* improve code

2020-02-13 14:06:17 +08:00

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Changes in Elastic 5.0

Enforce context.Context in PerformRequest and Do

We enforce the usage of context.Context everywhere you execute a request. You need to change all your Do() calls to pass a context: Do(ctx). This enables automatic request cancelation and many other patterns.

If you don't need this, simply pass context.TODO() or context.Background().

Warmers removed

Warmers are no longer necessary and have been removed in ES 5.0.

Optimize removed

Optimize was deprecated in ES 2.0 and has been removed in ES 5.0. Use Force Merge instead.

Missing Query removed

The missing query has been removed. Use exists query with must_not in bool query instead.

And Query removed

The and query has been removed. Use must clauses in a bool query instead.

Not Query removed

TODO Is it removed?

Or Query removed

The or query has been removed. Use should clauses in a bool query instead.

Filtered Query removed

The filtered query has been removed. Use bool query instead, which supports filter clauses too.

Limit Query removed

The limit query has been removed. Use the terminate_after parameter instead.

Template Query removed

The template query has been deprecated. You should use Search Templates instead.

We remove it from Elastic 5.0 as the 5.0 update is already a good opportunity to get rid of old stuff.

`_timestamp` and `_ttl` removed

Both of these fields were deprecated and are now removed.

Search template Put/Delete API returns `acknowledged` only

The response type for Put/Delete search templates has changed. It only returns a single acknowledged flag now.

Fields has been renamed to Stored Fields

The fields parameter has been renamed to stored_fields. See here.

Fielddatafields has been renamed to Docvaluefields

The fielddata_fields parameter has been renamed to docvalue_fields.

Type exists endpoint changed

The endpoint for checking whether a type exists has been changed from HEAD {index}/{type} to HEAD {index}/_mapping/{type}. See here.

Refresh parameter changed

The ?refresh parameter previously could be a boolean value. It indicated whether changes made by a request (e.g. by the Bulk API) should be immediately visible in search, or not. Using refresh=true had the positive effect of immediately seeing the changes when searching; the negative effect is that it is a rather big performance hit.

With 5.0, you now have the choice between these 3 values.

"true" - Refresh immediately
"false" - Do not refresh (the default value)
"wait_for" - Wait until ES made the document visible in search

See ?refresh in the documentation.

Notice that true and false (the boolean values) are no longer available now in Elastic. You must use a string instead, with one of the above values.

ReindexerService removed

The ReindexerService was a custom solution that was started in the ES 1.x era to automate reindexing data, from one index to another or even between clusters.

ES 2.3 introduced its own Reindex API so we're going to remove our custom solution and ask you to use the native reindexer.

The ReindexService is available via client.Reindex() (which used to point to the custom reindexer).

Delete By Query back in core

The Delete By Query API was moved into a plugin in 2.0. Now its back in core with a complete rewrite based on the Bulk API.

It has it's own endpoint at /_delete_by_query.

Delete By Query, Reindex, and Update By Query are very similar under the hood.

Reindex, Delete By Query, and Update By Query response changed

The response from the above APIs changed a bit. E.g. the retries value used to be an int64 and returns separate values for bulk and search now:

// Old
{
    ...
    "retries": 123,
    ...
}

// New
{
    ...
    "retries": {
        "bulk": 123,
        "search": 0
    },
    ...
}

ScanService removed

The ScanService is removed. Use the (new) ScrollService instead.

New ScrollService

There was confusion around ScanService and ScrollService doing basically the same. One was returning slices and didn't support all query details, the other returned one document after another and wasn't safe for concurrent use. So we merged the two and merged it into a new ScrollService that removes all the problems with the older services.

In other words: If you used ScanService, switch to ScrollService. If you used the old ScrollService, you might need to fix some things but overall it should just work.

Changes:

We replaced elastic.EOS with io.EOF to indicate the "end of scroll".

TODO Not implemented yet

Suggesters

They have been completely rewritten in ES 5.0.

Some changes:

Suggesters no longer have an output.

TODO Fix all structural changes in suggesters

Percolator

Percolator has changed considerably.

Elastic 5.0 adds the new Percolator Query which can be used in combination with the new Percolator type.

The Percolate service is removed from Elastic 5.0.

Remove Consistency, add WaitForActiveShards

The consistency parameter has been removed in a lot of places, e.g. the Bulk, Index, Delete, Delete-by-Query, Reindex, Update, and Update-by-Query API.

It has been replaced by a somewhat similar wait_for_active_shards parameter. See https://github.com/elastic/elasticsearch/pull/19454.

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