How to add single values ​​to a multi-valued field in solr

Question

I have a multi-valued field called a category (which is also a storage field) in which I need to add only different values

<field name="category">value1</field>
<field name="category">value2</field>

If I do the update as follows
<add>
<doc>
<field name="id">E02</field>
<field name="category" update="add">value2</field>
</doc>
</add>

I get the value 2 twice twice
<field name="category">value1</field>
<field name="category">value2</field>
<field name="category">value2</field>

I need to store / update only scattered values ​​in category fields, which are multi-valued fields. How to make it solr?

Thanks in advance, Jagadesh.

Answer 1

You can “install” instead of “add” to recreate the saved field in partial document updates. Therefore, if this is the case, when you have all the field values, just paste them into Set and then re-fill the field. You have all the data to recreate it due to the stored field requirement.