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We have a problem with our price filter. We are using magento 2.2.6 and Smile-SA/elasticsuite 2.6.x-dev.

When I go to a category and set a price range filter 0-0,99 I get results with a higher price. The URL looks like: /baelle/?price=0-1
When I query the ElasticSearch manually for one of the given SKUs the price looks always as the following for all customer groups:

price: [
 
 price: "0.0000",
 original_price: "79.9500",
 is_discount: true,
 customer_group_id: "0"
 
],

In the backend the product is configured with a price of 79.95 and no advanced pricing. In the catalog__product_index_price table it's stored like this:

But when I set special_price in the backend the price in ElasticSearch changes to the according special_price. Similar to the entries in catalog_product_index_price it looks now like this:

All of this happens to configurable and simple products alike and we have no idea where or what the problem could be.

Any ideas why the price filter is not working as expected?

Update

I figured out we have some products where the indexer is working as expected but for the majority it is not. CatalogModelResourceModelProductIndexerPriceDefaultPrice::prepareFinalPriceDataForType()
Is not beeing called either way.

I executed php bin/magento dev:tests:run unit to see if maybe an test for the indexer is failing but only one test failed and it has nothing to do with the indexer.

I tried to find a pattern which products are working as expected and which don't but I had no luck with it.

Update 2

I started to disable all third party modules. After disabling all, clearing all caches and executing bin/magento setup:di:compile there is still no difference.

Update 3

I have tried to run the dev/tests/integration/testsuite/Magento/Catalog/Model/Indexer/Product/Price integrations tests in order to figure out some more details but the tests fail straight away with the following error:

Error in fixture: "dev/tests/integration/testsuite/Magento/Catalog/_files/product_simple.php".
Unable to save Stock Item

Could this error lead into a wrong index?

It definitely looks like the price indexer is not working properly. I've checked it on Magento 2.2.6 vanilla and final_price, min_price and max_price have the same value as the price column.

The moment I change the price in admin all the values are changed (indexer set to on save). Maybe some extension is messing the indexer?

Without access to the code is hard to say but I would suggest to start debugging from

MagentoCatalogModelResourceModelProductIndexerPriceDefaultPrice::prepareFinalPriceDataForType()

function - it is a function that prepares the final price data for certain product type. In this function you can find a call to getSelect() which generates an sql query for getting the data. Check if this function is called, maybe some extension is overriding it. If it's called check the data that the query gets. Good luck!

The problem here was about the catalog_product_price index being built wrong. If a product has special_from_date set but no special_price set the indexer will set the final_price, min_price and max_price to 0.0000.

This behavior corrupts the prices for configurable products and the elasticsearch index alike.

To fix it make sure if no special_price is set there is not set a special_from_date either.

Or apply this commit as patch. Or update Magento to 2.2.8 or 3.0.