Sphinx3 installs skipping non-plain index 'dist1'.

the installation test is carried out on WIN7 for the first time using Sphinx,. The download on the official website is tested by default, and the result prompts the following:

D:\sphinx\bin>indexer.exe --config ../etc/sphinx.conf --all --rotate
Sphinx 3.0.3-dev (commit facc3fb)
Copyright (c) 2001-2018, Andrew Aksyonoff
Copyright (c) 2008-2016, Sphinx Technologies Inc (http://sphinxsearch.com)

using config file "../etc/sphinx.conf"...
indexing index "test1"...
collected 7 docs, 0.0 MB
sorted 0.0 Mhits, 100.0% done
total 7 docs, 0.3 Kb
total 0.1 sec, 2.7 Kb/sec, 71 docs/sec
indexing index "test1stemmed"...
collected 7 docs, 0.0 MB
sorted 0.0 Mhits, 100.0% done
total 7 docs, 0.3 Kb
total 0.1 sec, 3.9 Kb/sec, 103 docs/sec
skipping non-plain index "dist1"...
skipping non-plain index "rt"...
rotating indices: successfully sent SIGHUP to searchd (pid=11276).

D:\sphinx\bin>

mysql> show tables;
+--------------+-------------+
| Index        | Type        |
+--------------+-------------+
| dist1        | distributed |
| test1        | local       |
| test1stemmed | local       |
+--------------+-------------+
3 rows in set (0.00 sec)

A lot of questions:
1. Why do you prompt this skipping non-plain index "dist1".? Skipping non-plain index "rt".
2. After the above code runs, enter mysql-P9306 , in which there is no rt index.
3, the latter is unable to complete
4, the bigger question, what is the difference between rt and local? Is rt the most automatically loaded by sphinx if you modify the data in the mysql table

Mar.07,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e43f73-26fb4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e43f73-26fb4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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