1- Export JSON file from Apache SOLR
The first step is to get the whole set of data belonging to a specific core. It is simple as open Postman and run a query to the selected SOLR core:
https://solrserver/solr/corename/select?q=*&rows=2147483647
It is important to add the parameter rows, setting a very high number in order to get all the documents (otherwise results will be paginated).
Once you run the query you can save the results file:

2- Create an account in Algolia
Open Algolia and Sign Up for a free trial.
3- Create new Algolia index and import the JSON file
Once you are logged in, you can proceed to create a new Algolia index. From the dashboard left menu, select Indexes and so "New index". Then select "Add records", "Upload file". Drag & Drop the JSON file created in the first step.

4- Configure the index
Now you have many options and possibilities. The basic configurations should include at least:
- Set the searchable attributes
- Define sorting & ranking
- Configure Facet attributes
The following screenshot reports possible configuration of facets according to the imported index and its fields:

5- Generate demo UI
A simple User Interface can be automatically created thanks to the Algolia features. The way to do it is to enter "UI Demos" option and select "Generate a UI demo".
You will have access to two main types of UI: Search & facets and Search bar with auto-completion.
Search & facets demo:

Search bar with autocomplete demo:

6- Make it real!
The following step is to enter into the details of the data, tune them, make a preprocess elaboration before to import the index, define the proper Algolia configuration, create a custom and marvelous user experience and integrate it into your Commerce Composable ecosystem.
It is guaranteed your conversion rate will be improved! Having a greate search user experience will boost your sales. Do you want to make it real? Contact us about Algolia, we will be available for a call and enter into the details of your catalog data.

CEO at Orienteed.