When creating an index from elasticsearch_connector settings "/admin/config/search/elasticsearch-connector/index/add" it allows to select a number of shards and replicas, but when you clear index from search_api settings, it automatically recreates new index but without this settings.
In code, it trying to get option from Index entity, but it's instance of "\Drupal\search_api\IndexInterface":
<?php
public static function create(IndexInterface $index) {
$indexName = static::getIndexName($index);
$indexConfig = [
'index' => $indexName,
'body' => [
'settings' => [
'number_of_shards' => $index->getOption('number_of_shards', 5),
'number_of_replicas' => $index->getOption('number_of_replicas', 1),
],
],
];
?>Proposed solution is to duplicate shards and replicas to search_api index settings.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Patch #5 applies (with a small change) on 7.0.0alpha4 and finally allows me to limit the number of shards to 1, which I require for better scoring (TF-IDF).
Adjusted patch #5 to provide better schema handling
Upgraded patch to use third party settings, otherwise the schema could not be resolved to a correct shema
Also added adding the index if it doesn't exists on indexing (otherwise the server creates a default one)