Fixing error message to avoid user confusion (#1222)

We still use `Override` internally, however in config there is
`tableName`

```
processors:
  - name: my-query-processor
    type: quesma-v1-processor-query
    config:
      indexes:
        kibana_sample_data_ecommerce:
          target: [ my-clickhouse-data-source ]
          tableName: "kibana_sample_data_ecommerce_ext"
```

This PR updates property name according to configuration and
documentation

quesma/quesma/config/config_v2.go

@@ -314,7 +314,7 @@ func (c *QuesmaNewConfiguration) validatePipelines() error {
 					continue
 				}
 				if queryIndexConf.Override != ingestIndexConf.Override {
-					return fmt.Errorf("ingest and query processors must have the same configuration of 'Override' for index '%s' due to current limitations", indexName)
+					return fmt.Errorf("ingest and query processors must have the same configuration of 'tableName' for index '%s' due to current limitations", indexName)
 				}
 				if queryIndexConf.UseCommonTable != ingestIndexConf.UseCommonTable {
 					return fmt.Errorf("ingest and query processors must have the same configuration of 'useCommonTable' for index '%s' due to current limitations", indexName)