Solr Miscs

Atomic Updates
https://wiki.apache.org/solr/Atomic_Updates
<add>
  <doc>
    <field name="employeeId">05991</field>
    <field name="office" update="set">Walla Walla</field>
    <field name="skills" update="add">Python</field>
  </doc>
</add>
update = "add" | "set" | "inc"
boost = <float> — default is 1.0.

https://wiki.apache.org/solr/UpdateXmlMessages
"delete" documents by ID and by Query
<delete><id>05991</id></delete>
<delete><query>office:Bridgewater</query></delete>
<delete>
  <id>05991</id><id>06000</id>
  <query>office:Bridgewater</query>
  <query>office:Osaka</query>

</delete>