Dropping columns from the index

Remove a CQL column using the ALTER SEARCH INDEX SCHEMA field shortcut. The field is removed based on the name that is defined in the schema.

Remove a CQL column from the index:
- Remove a regular column:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP field intfield; ALTER TABLE wiki.solr DROP intfield int;
- Remove a tuple column from the index:
  
  When dropping the base field name, drop the TupleField and all the child fields:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP field fieldname;
  To drop individual child fields:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP field "fieldname.field1";
- Remove a field that contains an asterisk in the name:
  
  To remove a field that contains an asterisk in the name, enclose the field name in double quotation marks:
  ALTER SEARCH INDEX SCHEMA ON wiki,solr DROP field "fieldname*";
  Alternatively, use the long form of the command:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP fields.field[@name='fieldname*'];
- Remove a field that contains an incorrect XML path:
  
  For example, assume a field was added with an incorrect XML path that is not nested inside the <fields> tag:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr ADD field[@name='fieldname', @type='StrField'];
  Example XML fragment showing that the new field is outside of the <fields> tag:
  <fields> ... </fields> <field name="fieldname" type="StrField"/>
  If you use the short form of the ALTER SEARCH INDEX SCHEMA command, the command returns an error because it is assumed that the field is nested inside of the <fields> tag in the XML:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP field fieldname;
  InvalidRequest: Error from server: code=2200 [Invalid query] message= \ "The search index schema could not be updated because: \ Cannot drop resource element fields.field[@name='fieldname'] \ because it doesn't exist"
  To drop the field, use the long form of the ALTER SEARCH INDEX SCHEMA command:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP field[@name='fieldname'];
- Remove a dynamic field:
  
  To remove a dynamic field, use the long form of the ALTER SEARCH INDEX SCHEMA command because the field name always contains an asterisk:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP fields.dynamicField[@name='fieldname*'];
- Remove a copy field:
  
  To remove a copy field, use the long form of the `ALTER SEARCH INDEX SCHEMA`command because the source and destination fields must be specified:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP copyField[@source='sourcefieldname', @dest='destfieldname'];
- Remove associated copy fields and resolve dependencies:
  
  If you attempt to remove a field that has an associated copy field, the ALTER SEARCH INDEX SCHEMA command returns an invalid request error:
  ALTER SEARCH INDEX SCHEMA ON wiki.solr DROP fields.dynamicField[@name='copyfieldname*'];
  InvalidRequest: Error from server: code=2200 [Invalid query] message= \ "The search index schema is not valid because: \ Can't load schema schema.xml: copyField dest :'copyfieldname*' \ is not an explicit field and doesn't match a dynamicField."
  To remove the field, remove all of the underlying child elements first and then remove the field.

Verify the pending changes:

DESCRIBE PENDING SEARCH INDEX SCHEMA ON [keyspace_name.]table_name;

Activate the changes:
```
RELOAD SEARCH INDEX ON [keyspace_name.]table_name;
```
Copies the pending schema over the active schema. New transactions, such as data inserted into the table, are processed using the active schema. The existing data is not effected by a schema change.
Rebuild the index:
```
REBUILD SEARCH INDEX ON [keyspace_name.]table_name;
```
The REBUILD SEARCH INDEX regenerates the index using existing data. Rebuilding is required when changing the way that data is indexed, such as changing the type of field or if a field is added to the index.

Dropping columns from the index

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