[eslint] remove non used vars

[ananzh]

What is the issue?
There are 272 non used vars in the code .
They could not be cleaned by running yarn lint --fix or `npx lint -- --fix"

yarn lint
yarn run v1.22.5
$ eslint .

/home/anan/work/opensearch-js/index.js
  289:36  error  'reject' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/lib/Connection.js
  252:20  error  'depth' is defined but never used                   no-unused-vars
  252:27  error  'options' is defined but never used                 no-unused-vars
  253:13  error  'authorization' is assigned a value but never used  no-unused-vars
  268:13  error  'authorization' is assigned a value but never used  no-unused-vars

/home/anan/work/opensearch-js/lib/Helpers.js
  100:13  error  'method' is assigned a value but never used  no-unused-vars
  100:21  error  'body' is assigned a value but never used    no-unused-vars
  100:27  error  'index' is assigned a value but never used   no-unused-vars
  202:12  error  'size' is defined but never used             no-unused-vars
  335:38  error  'reject' is defined but never used           no-unused-vars
  349:40  error  'reject' is defined but never used           no-unused-vars
  652:40  error  'reject' is defined but never used           no-unused-vars

/home/anan/work/opensearch-js/lib/Transport.js
  674:28  error  'params' is defined but never used   no-unused-vars
  674:36  error  'options' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/scripts/release-canary.js
  93:18  error  'question' is defined but never used  no-unused-vars
  94:32  error  'reject' is defined but never used    no-unused-vars

/home/anan/work/opensearch-js/scripts/utils/generateApis.js
  270:30  error  'param' is defined but never used  no-unused-vars
  322:50  error  'index' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/acceptance/events-order.test.js
   60:41  error  'request' is defined but never used  no-unused-vars
   65:35  error  'request' is defined but never used  no-unused-vars
   70:43  error  'request' is defined but never used  no-unused-vars
   75:36  error  'request' is defined but never used  no-unused-vars
   80:21  error  'result' is defined but never used   no-unused-vars
   97:41  error  'request' is defined but never used  no-unused-vars
  102:35  error  'request' is defined but never used  no-unused-vars
  107:38  error  '_err' is defined but never used     no-unused-vars
  107:44  error  'request' is defined but never used  no-unused-vars
  111:36  error  'request' is defined but never used  no-unused-vars
  116:21  error  'result' is defined but never used   no-unused-vars
  133:41  error  'request' is defined but never used  no-unused-vars
  138:35  error  'request' is defined but never used  no-unused-vars
  143:38  error  '_err' is defined but never used     no-unused-vars
  143:44  error  'request' is defined but never used  no-unused-vars
  147:36  error  'request' is defined but never used  no-unused-vars
  152:21  error  'result' is defined but never used   no-unused-vars
  169:41  error  'request' is defined but never used  no-unused-vars
  174:35  error  'request' is defined but never used  no-unused-vars
  179:38  error  '_err' is defined but never used     no-unused-vars
  179:44  error  'request' is defined but never used  no-unused-vars
  183:36  error  'request' is defined but never used  no-unused-vars
  188:37  error  'result' is defined but never used   no-unused-vars
  200:15  error  'params' is defined but never used   no-unused-vars
  216:41  error  'request' is defined but never used  no-unused-vars
  221:35  error  'request' is defined but never used  no-unused-vars
  226:43  error  'request' is defined but never used  no-unused-vars
  231:36  error  'request' is defined but never used  no-unused-vars
  236:21  error  'result' is defined but never used   no-unused-vars
  246:15  error  'params' is defined but never used   no-unused-vars
  269:41  error  'request' is defined but never used  no-unused-vars
  274:35  error  'request' is defined but never used  no-unused-vars
  279:43  error  'request' is defined but never used  no-unused-vars
  284:36  error  'request' is defined but never used  no-unused-vars
  289:21  error  'result' is defined but never used   no-unused-vars
  306:41  error  'request' is defined but never used  no-unused-vars
  311:35  error  'request' is defined but never used  no-unused-vars
  316:38  error  '_err' is defined but never used     no-unused-vars
  316:44  error  'request' is defined but never used  no-unused-vars
  320:31  error  '_err' is defined but never used     no-unused-vars
  320:37  error  'request' is defined but never used  no-unused-vars
  326:47  error  'result' is defined but never used   no-unused-vars
  360:41  error  'request' is defined but never used  no-unused-vars
  365:35  error  'request' is defined but never used  no-unused-vars
  370:43  error  'request' is defined but never used  no-unused-vars
  375:36  error  'request' is defined but never used  no-unused-vars
  380:21  error  'result' is defined but never used   no-unused-vars
  411:43  error  'request' is defined but never used  no-unused-vars
  416:37  error  'request' is defined but never used  no-unused-vars
  421:45  error  'request' is defined but never used  no-unused-vars
  426:38  error  'request' is defined but never used  no-unused-vars
  431:23  error  'result' is defined but never used   no-unused-vars

/home/anan/work/opensearch-js/test/acceptance/resurrect.test.js
   85:25  error  'result' is defined but never used  no-unused-vars
   93:25  error  'result' is defined but never used  no-unused-vars
  149:25  error  'result' is defined but never used  no-unused-vars
  157:25  error  'result' is defined but never used  no-unused-vars
  165:25  error  'result' is defined but never used  no-unused-vars
  214:25  error  'result' is defined but never used  no-unused-vars
  222:25  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/acceptance/sniff.test.js
  202:36  error  'kill' is defined but never used    no-unused-vars
  223:36  error  'kill' is defined but never used    no-unused-vars
  251:36  error  'kill' is defined but never used    no-unused-vars
  279:23  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/benchmarks/suite.js
  128:35  error  'q' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/bundlers/parcel-test/index.js
  16:19  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/bundlers/rollup-test/index.js
  16:19  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/bundlers/webpack-test/index.js
  16:19  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/integration/helpers-secure/search.test.js
  40:16  error  'doc' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/integration/helpers/bulk.test.js
   60:12  error  'doc' is defined but never used  no-unused-vars
   63:16  error  'doc' is defined but never used  no-unused-vars
   88:12  error  'doc' is defined but never used  no-unused-vars
  162:12  error  'doc' is defined but never used  no-unused-vars
  191:12  error  'doc' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/integration/helpers/msearch.test.js
  52:16  error  'doc' is defined but never used     no-unused-vars
  93:75  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/integration/helpers/scroll.test.js
  52:16  error  'doc' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/integration/helpers/search.test.js
  52:16  error  'doc' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/unit/api.test.js
  109:15  error  'body' is defined but never used      no-unused-vars
  309:15  error  'body' is defined but never used      no-unused-vars
  309:21  error  'warnings' is defined but never used  no-unused-vars
  328:13  error  'body' is defined but never used      no-unused-vars
  356:72  error  'result' is defined but never used    no-unused-vars

/home/anan/work/opensearch-js/test/unit/child.test.js
   64:23  error  'res' is defined but never used   no-unused-vars
   66:24  error  'res' is defined but never used   no-unused-vars
   88:23  error  'res' is defined but never used   no-unused-vars
   90:24  error  'res' is defined but never used   no-unused-vars
  159:33  error  'meta' is defined but never used  no-unused-vars
  163:22  error  'res' is defined but never used   no-unused-vars
  178:33  error  'meta' is defined but never used  no-unused-vars
  182:27  error  'res' is defined but never used   no-unused-vars
  196:32  error  'meta' is defined but never used  no-unused-vars
  200:22  error  'res' is defined but never used   no-unused-vars
  215:32  error  'meta' is defined but never used  no-unused-vars
  219:27  error  'res' is defined but never used   no-unused-vars
  313:23  error  'res' is defined but never used   no-unused-vars
  315:24  error  'res' is defined but never used   no-unused-vars

/home/anan/work/opensearch-js/test/unit/client.test.js
   620:45  error  'result' is defined but never used              no-unused-vars
   620:53  error  'ConfigurationError' is defined but never used  no-unused-vars
   631:32  error  'makeRequest' is defined but never used         no-unused-vars
   631:45  error  'result' is defined but never used              no-unused-vars
   631:53  error  'ConfigurationError' is defined but never used  no-unused-vars
   647:32  error  'makeRequest' is defined but never used         no-unused-vars
   647:45  error  'result' is defined but never used              no-unused-vars
   647:53  error  'ConfigurationError' is defined but never used  no-unused-vars
   648:15  error  'params' is defined but never used              no-unused-vars
   648:23  error  'options' is defined but never used             no-unused-vars
   649:38  error  'reject' is defined but never used              no-unused-vars
   898:25  error  'body' is defined but never used                no-unused-vars
   924:25  error  'body' is defined but never used                no-unused-vars
  1076:21  error  'result' is defined but never used              no-unused-vars
  1105:21  error  'result' is defined but never used              no-unused-vars

/home/anan/work/opensearch-js/test/unit/connection.test.js
   292:13  error  'res' is defined but never used       no-unused-vars
   319:15  error  'res' is defined but never used       no-unused-vars
   345:15  error  'res' is defined but never used       no-unused-vars
   382:13  error  'res' is defined but never used       no-unused-vars
   416:13  error  'res' is defined but never used       no-unused-vars
   450:13  error  'res' is defined but never used       no-unused-vars
   561:13  error  'res' is defined but never used       no-unused-vars
   587:13  error  'res' is defined but never used       no-unused-vars
   619:13  error  'res' is defined but never used       no-unused-vars
   706:11  error  'res' is defined but never used       no-unused-vars
   892:20  error  'req' is defined but never used       no-unused-vars
   892:25  error  'res' is defined but never used       no-unused-vars
   905:13  error  'res' is defined but never used       no-unused-vars
   931:13  error  'res' is defined but never used       no-unused-vars
   986:10  error  'size' is defined but never used      no-unused-vars
  1000:11  error  'response' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/unit/events.test.js
   83:11  error  'result' is defined but never used  no-unused-vars
  131:11  error  'result' is defined but never used  no-unused-vars
  141:11  error  'result' is defined but never used  no-unused-vars
  192:11  error  'result' is defined but never used  no-unused-vars
  202:11  error  'result' is defined but never used  no-unused-vars
  253:11  error  'result' is defined but never used  no-unused-vars
  307:11  error  'result' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/unit/helpers/bulk.test.js
    76:20  error  'doc' is defined but never used     no-unused-vars
    81:16  error  'doc' is defined but never used     no-unused-vars
   119:20  error  'doc' is defined but never used     no-unused-vars
   124:16  error  'doc' is defined but never used     no-unused-vars
   158:20  error  'doc' is defined but never used     no-unused-vars
   163:16  error  'doc' is defined but never used     no-unused-vars
   206:20  error  'doc' is defined but never used     no-unused-vars
   251:20  error  'doc' is defined but never used     no-unused-vars
   291:20  error  'doc' is defined but never used     no-unused-vars
   299:16  error  'doc' is defined but never used     no-unused-vars
   362:20  error  'doc' is defined but never used     no-unused-vars
   413:20  error  'doc' is defined but never used     no-unused-vars
   488:20  error  'doc' is defined but never used     no-unused-vars
   518:19  error  'params' is defined but never used  no-unused-vars
   534:20  error  'doc' is defined but never used     no-unused-vars
   539:16  error  'doc' is defined but never used     no-unused-vars
   554:19  error  'params' is defined but never used  no-unused-vars
   570:20  error  'doc' is defined but never used     no-unused-vars
   575:16  error  'doc' is defined but never used     no-unused-vars
   635:20  error  'doc' is defined but never used     no-unused-vars
   640:16  error  'doc' is defined but never used     no-unused-vars
   661:19  error  'params' is defined but never used  no-unused-vars
   675:22  error  'doc' is defined but never used     no-unused-vars
   718:20  error  'doc' is defined but never used     no-unused-vars
   726:16  error  'doc' is defined but never used     no-unused-vars
   775:20  error  'doc' is defined but never used     no-unused-vars
   780:16  error  'doc' is defined but never used     no-unused-vars
   824:18  error  'doc' is defined but never used     no-unused-vars
   832:14  error  'doc' is defined but never used     no-unused-vars
   873:18  error  'doc' is defined but never used     no-unused-vars
   886:14  error  'doc' is defined but never used     no-unused-vars
   924:18  error  'doc' is defined but never used     no-unused-vars
   934:14  error  'doc' is defined but never used     no-unused-vars
   972:18  error  'doc' is defined but never used     no-unused-vars
   985:14  error  'doc' is defined but never used     no-unused-vars
  1026:18  error  'doc' is defined but never used     no-unused-vars
  1034:14  error  'doc' is defined but never used     no-unused-vars
  1097:18  error  'doc' is defined but never used     no-unused-vars
  1164:20  error  'doc' is defined but never used     no-unused-vars
  1167:16  error  'doc' is defined but never used     no-unused-vars
  1202:20  error  'doc' is defined but never used     no-unused-vars
  1223:20  error  'doc' is defined but never used     no-unused-vars
  1283:18  error  'doc' is defined but never used     no-unused-vars
  1288:14  error  'doc' is defined but never used     no-unused-vars
  1341:18  error  'doc' is defined but never used     no-unused-vars
  1346:14  error  'doc' is defined but never used     no-unused-vars
  1387:18  error  'doc' is defined but never used     no-unused-vars
  1392:14  error  'doc' is defined but never used     no-unused-vars

/home/anan/work/opensearch-js/test/unit/helpers/msearch.test.js
   40:15  error  'params' is defined but never used  no-unused-vars
   89:15  error  'params' is defined but never used  no-unused-vars
  165:15  error  'params' is defined but never used  no-unused-vars
  239:15  error  'params' is defined but never used  no-unused-vars
  266:15  error  'params' is defined but never used  no-unused-vars
  280:75  error  'result' is defined but never used  no-unused-vars
  289:15  error  'params' is defined but never used  no-unused-vars
  301:62  error  'result' is defined but never used  no-unused-vars
  316:15  error  'params' is defined but never used  no-unused-vars
  328:43  error  'result' is defined but never used  no-unused-vars
  342:15  error  'params' is defined but never used  no-unused-vars
  402:15  error  'params' is defined but never used  no-unused-vars
  436:15  error  'params' is defined but never used  no-unused-vars
  471:15  error  'params' is defined but never used  no-unused-vars
  487:6   error  'e' is defined but never used       no-unused-vars
  490:12  error  'e' is defined but never used       no-unused-vars
  497:15  error  'params' is defined but never used  no-unused-vars
  518:52  error  'result' is defined but never used  no-unused-vars
  527:15  error  'params' is defined but never used  no-unused-vars
  595:15  error  'params' is defined but never used  no-unused-vars
  651:15  error  'params' is defined but never used  no-unused-vars
  684:77  error  'result' is defined but never used  no-unused-vars
  696:15  error  'params' is defined but never used  no-unused-vars
  720:15  error  'params' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/unit/helpers/scroll.test.js
  194:15  error  'params' is defined but never used  no-unused-vars
  341:15  error  'params' is defined but never used  no-unused-vars

/home/anan/work/opensearch-js/test/unit/transport.test.js
   455:13  error  'body' is defined but never used        no-unused-vars
   487:13  error  'body' is defined but never used        no-unused-vars
   517:13  error  'body' is defined but never used        no-unused-vars
   547:13  error  'body' is defined but never used        no-unused-vars
   580:15  error  'body' is defined but never used        no-unused-vars
   620:13  error  'body' is defined but never used        no-unused-vars
   658:13  error  'body' is defined but never used        no-unused-vars
   764:15  error  'body' is defined but never used        no-unused-vars
   817:15  error  'body' is defined but never used        no-unused-vars
   873:15  error  'body' is defined but never used        no-unused-vars
   985:13  error  'result' is defined but never used      no-unused-vars
  1099:11  error  'result' is defined but never used      no-unused-vars
  1155:13  error  'result' is defined but never used      no-unused-vars
  1228:15  error  'body' is defined but never used        no-unused-vars
  1334:15  error  'body' is defined but never used        no-unused-vars
  1400:27  error  'hosts' is defined but never used       no-unused-vars
  1442:17  error  'body' is defined but never used        no-unused-vars
  1475:18  error  'connection' is defined but never used  no-unused-vars
  1549:13  error  'body' is defined but never used        no-unused-vars
  1562:13  error  'body' is defined but never used        no-unused-vars
  1600:15  error  'body' is defined but never used        no-unused-vars
  1643:19  error  'body' is defined but never used        no-unused-vars
  1680:19  error  'body' is defined but never used        no-unused-vars
  1718:19  error  'body' is defined but never used        no-unused-vars
  1755:19  error  'body' is defined but never used        no-unused-vars
  1850:15  error  'body' is defined but never used        no-unused-vars
  1879:15  error  'body' is defined but never used        no-unused-vars
  1969:15  error  'body' is defined but never used        no-unused-vars
  2364:17  error  'body' is defined but never used        no-unused-vars
  2372:21  error  'body' is defined but never used        no-unused-vars
  2380:25  error  'body' is defined but never used        no-unused-vars
  2445:23  error  'meta' is defined but never used        no-unused-vars
  2750:15  error  'body' is defined but never used        no-unused-vars
  2814:17  error  'body' is defined but never used        no-unused-vars
  2850:17  error  'body' is defined but never used        no-unused-vars
  2922:13  error  'body' is defined but never used        no-unused-vars
  2957:13  error  'body' is defined but never used        no-unused-vars

/home/anan/work/opensearch-js/test/utils/buildProxy.js
  30:32  error  'reject' is defined but never used    no-unused-vars
  39:32  error  'reject' is defined but never used    no-unused-vars
  47:23  error  'handler' is defined but never used   no-unused-vars
  47:32  error  'callback' is defined but never used  no-unused-vars
  48:32  error  'reject' is defined but never used    no-unused-vars
  56:29  error  'handler' is defined but never used   no-unused-vars
  56:38  error  'callback' is defined but never used  no-unused-vars
  57:32  error  'reject' is defined but never used    no-unused-vars

/home/anan/work/opensearch-js/test/utils/buildServer.js
  68:34  error  'reject' is defined but never used  no-unused-vars

✖ 272 problems (272 errors, 0 warnings)

How can one reproduce the bug?
After eslint PR is merged
Go to '.eslintrc.json'
Remove ' "no-dupe-else-if": "off"'
Run yarn lint
See error

What is the expected behavior?
clean out

[nhtruong]

I'm going to look into this.