IndexCreator example

        // Alias does not exists, swap directly         $indices->expects(static::once())->method('existsAlias')->with(['name' => 'bla'])->willReturn(false);
        $indices->expects(static::once())->method('refresh')->with(['index' => 'foo']);
        $indices->expects(static::once())->method('putAlias')->with(['index' => 'foo', 'name' => 'bla']);

        $client
            ->method('indices')
            ->willReturn($indices);

        $index = new IndexCreator(
            $client,
            [
                'settings' => $constructorConfig,
            ],
            $this->createMock(IndexMappingProvider::class),
            new EventDispatcher()
        );

        $definition = $this->createMock(ElasticsearchProductDefinition::class);
        $index->createIndex($definition, 'foo', 'bla', Context::createDefaultContext());
    }