# Extend search index
**URL:** https://forum.litium.com/t/extend-search-index/1875
**Category:** Questions
**Created:** [February 5, 2021, 12:58pm UTC](https://forum.litium.com/t/extend-search-index/1875 "2021-02-05T12:58:18Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@mynameisandreas](https://forum.litium.com/u/mynameisandreas)
#### Post date: [February 5, 2021, 12:58pm UTC](https://forum.litium.com/t/extend-search-index/1875/1 "2021-02-05T12:58:19Z")
How can I extend searchindex (per variant) to contain more data than it has today?
I want to add WareHouseID - InStockQuantity - ErpStatus to easier add a filter for product listning “Only show products in stock”
Litium version: 7.4
---
### Author:  [@NilsN](https://forum.litium.com/u/NilsN)
#### Post date: [February 5, 2021, 2:27pm UTC](https://forum.litium.com/t/extend-search-index/1875/2 "2021-02-05T14:27:07Z")
(Assuming you are using [Lucene.NET](http://Lucene.NET))
Quantity for each warehouse and variant is already added into the index. You can add the tag to your query by using `TagNames.GetTagNameForWarehouseQuantity(inventorySystemId)` to resolve the correct tag name.
So filtering on stock balance when searching could look something like:
```auto
var country = _requestModelAccessor.RequestModel.CountryModel;
// get all inventories used for the current country
var inventorySystemIds = _inventoryService.GetAll()
.Where(inventory => inventory.CountryLinks
.Any(x => x.CountrySystemId == country.SystemId))
.Select(x => x.SystemId)
.ToList();
// add an optional clause where the stock balance should be 1-999999 for any of the connected inventories
var inventoryQuantityClause = new OptionalTagClause();
foreach (var inventory in inventorySystemIds)
{
inventoryQuantityClause.Tags.Add(new RangeTag(TagNames.GetTagNameForWarehouseQuantity(inventory), 1, 999999));
}
_request.FilterTags.Add(inventoryQuantityClause);
```
You can add an `IIndexingProviderPreProcessor` to add data for `ErpStatus` into the index. In the Accelerator there’s an example called `CampaignIndexingProviderPreProcessor` you could have a look at. There’s an older extension method you could use to resolve a fitting name for the tag, `TagNames.GetTagNameForWarehouseArticleStatus(inventorySystemId);`
Keep in mind that if you’re merging variant data in the index, if any of the merged variant has stock it will be included.
---
### Author:  [@system](https://forum.litium.com/u/system)
#### Post date: [March 5, 2021, 2:27pm UTC](https://forum.litium.com/t/extend-search-index/1875/3 "2021-03-05T14:27:24Z")
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