Re-enable indexing on GKE logs with reduced schema

detailed error:
```
{"type":"illegal_argument_exception","reason":"field expansion matches too many fields, limit: 1024, got: 1629"}}}]},"status":400}
```

see: https://www.elastic.co/guide/en/elasticsearch/reference/current/search-settings.html for more background

this config option cannot be adjusted through the API:
```
"persistent setting [indices.query.bool.max_clause_count], not dynamically updateable"
```

we need to bring down the number of fields in the indices

---

Here is an example request/response:

<details>

```
{
  "version": true,
  "size": 500,
  "sort": [
    {
      "json.time": {
        "order": "desc",
        "unmapped_type": "boolean"
      }
    }
  ],
  "_source": {
    "excludes": []
  },
  "aggs": {
    "2": {
      "date_histogram": {
        "field": "json.time",
        "fixed_interval": "30s",
        "time_zone": "UTC",
        "min_doc_count": 1
      }
    }
  },
  "stored_fields": [
    "*"
  ],
  "script_fields": {
    "controller_and_action": {
      "script": {
        "source": "doc['json.controller.keyword'] + \"#\" + doc['json.action.keyword']",
        "lang": "painless"
      }
    }
  },
  "docvalue_fields": [
    {
      "field": "@timestamp",
      "format": "date_time"
    },
    {
      "field": "json.expiry_from",
      "format": "date_time"
    },
    {
      "field": "json.expiry_to",
      "format": "date_time"
    },
    {
      "field": "json.extra.bucket.start",
      "format": "date_time"
    },
    {
      "field": "json.extra.bucket.stop",
      "format": "date_time"
    },
    {
      "field": "json.extra.commits.timestamp",
      "format": "date_time"
    },
    {
      "field": "json.extra.created_after",
      "format": "date_time"
    },
    {
      "field": "json.extra.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.created_before",
      "format": "date_time"
    },
    {
      "field": "json.extra.due_date",
      "format": "date_time"
    },
    {
      "field": "json.extra.head_commit.timestamp",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.base.repo.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.base.repo.pushed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.base.repo.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.closed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.head.repo.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.head.repo.pushed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.head.repo.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.merged_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.pull_request.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.raw_response.created_on",
      "format": "date_time"
    },
    {
      "field": "json.extra.raw_response.updated_on",
      "format": "date_time"
    },
    {
      "field": "json.extra.repository.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.bucket.start",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.bucket.stop",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.commits.timestamp",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.head_commit.timestamp",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.base.repo.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.base.repo.pushed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.base.repo.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.closed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.head.repo.created_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.head.repo.pushed_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.head.repo.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.merged_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.pull_request.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.extra.request_forgery_protection.repository.updated_at",
      "format": "date_time"
    },
    {
      "field": "json.time",
      "format": "date_time"
    },
    {
      "field": "publish_time",
      "format": "date_time"
    }
  ],
  "query": {
    "bool": {
      "must": [],
      "filter": [
        {
          "multi_match": {
            "type": "best_fields",
            "query": "ExternalDiffUploader",
            "lenient": true
          }
        },
        {
          "match_phrase": {
            "json.controller": {
              "query": "Projects::MergeRequests::DiffsController"
            }
          }
        },
        {
          "range": {
            "json.time": {
              "format": "strict_date_optional_time",
              "gte": "2020-03-27T12:00:00.000Z",
              "lte": "2020-03-27T12:30:00.000Z"
            }
          }
        }
      ],
      "should": [],
      "must_not": []
    }
  },
  "highlight": {
    "pre_tags": [
      "@kibana-highlighted-field@"
    ],
    "post_tags": [
      "@/kibana-highlighted-field@"
    ],
    "fields": {
      "*": {}
    },
    "fragment_size": 2147483647
  }
}
```
</details>

Response: 
<details>

```
{
  "took": 5158,
  "timed_out": false,
  "_shards": {
    "total": 762,
    "successful": 750,
    "skipped": 750,
    "failed": 12,
    "failures": [
      {
        "shard": 0,
        "index": "pubsub-rails-inf-gprd-001925",
        "node": "jmnNQegZRWOO0aJBFjnZew",
        "reason": {
          "type": "query_shard_exception",
          "reason": "failed to create query: {\n  \"bool\" : {\n    \"filter\" : [\n      {\n        \"multi_match\" : {\n          \"query\" : \"ExternalDiffUploader\",\n          \"fields\" : [ ],\n          \"type\" : \"best_fields\",\n          \"operator\" : \"OR\",\n          \"slop\" : 0,\n          \"prefix_length\" : 0,\n          \"max_expansions\" : 50,\n          \"lenient\" : true,\n          \"zero_terms_query\" : \"NONE\",\n          \"auto_generate_synonyms_phrase_query\" : true,\n          \"fuzzy_transpositions\" : true,\n          \"boost\" : 1.0\n        }\n      },\n      {\n        \"match_phrase\" : {\n          \"json.controller\" : {\n            \"query\" : \"Projects::MergeRequests::DiffsController\",\n            \"slop\" : 0,\n            \"zero_terms_query\" : \"NONE\",\n            \"boost\" : 1.0\n          }\n        }\n      },\n      {\n        \"range\" : {\n          \"json.time\" : {\n            \"from\" : \"2020-03-27T12:00:00.000Z\",\n            \"to\" : \"2020-03-27T12:30:00.000Z\",\n            \"include_lower\" : true,\n            \"include_upper\" : true,\n            \"format\" : \"strict_date_optional_time\",\n            \"boost\" : 1.0\n          }\n        }\n      }\n    ],\n    \"adjust_pure_negative\" : true,\n    \"boost\" : 1.0\n  }\n}",
          "index_uuid": "HunDEJAFRKieC7kFcif7zw",
          "index": "pubsub-rails-inf-gprd-001925",
          "caused_by": {
            "type": "illegal_argument_exception",
            "reason": "field expansion matches too many fields, limit: 1024, got: 1470"
          }
        }
      },
      {
        "shard": 0,
        "index": "pubsub-rails-inf-gprd-001926",
        "node": "Nce627z_R7aRVIjH1JkAog",
        "reason": {
          "type": "query_shard_exception",
          "reason": "failed to create query: {\n  \"bool\" : {\n    \"filter\" : [\n      {\n        \"multi_match\" : {\n          \"query\" : \"ExternalDiffUploader\",\n          \"fields\" : [ ],\n          \"type\" : \"best_fields\",\n          \"operator\" : \"OR\",\n          \"slop\" : 0,\n          \"prefix_length\" : 0,\n          \"max_expansions\" : 50,\n          \"lenient\" : true,\n          \"zero_terms_query\" : \"NONE\",\n          \"auto_generate_synonyms_phrase_query\" : true,\n          \"fuzzy_transpositions\" : true,\n          \"boost\" : 1.0\n        }\n      },\n      {\n        \"match_phrase\" : {\n          \"json.controller\" : {\n            \"query\" : \"Projects::MergeRequests::DiffsController\",\n            \"slop\" : 0,\n            \"zero_terms_query\" : \"NONE\",\n            \"boost\" : 1.0\n          }\n        }\n      },\n      {\n        \"range\" : {\n          \"json.time\" : {\n            \"from\" : \"2020-03-27T12:00:00.000Z\",\n            \"to\" : \"2020-03-27T12:30:00.000Z\",\n            \"include_lower\" : true,\n            \"include_upper\" : true,\n            \"format\" : \"strict_date_optional_time\",\n            \"boost\" : 1.0\n          }\n        }\n      }\n    ],\n    \"adjust_pure_negative\" : true,\n    \"boost\" : 1.0\n  }\n}",
          "index_uuid": "URp08IJpRjKQ6kRnKFJQ8w",
          "index": "pubsub-rails-inf-gprd-001926",
          "caused_by": {
            "type": "illegal_argument_exception",
            "reason": "field expansion matches too many fields, limit: 1024, got: 1136"
          }
        }
      }
    ]
  },
  "hits": {
    "total": 0,
    "max_score": 0,
    "hits": []
  }
}
```

</details>

Story points: 3.0