Faster field lookups by eliminating looping on schema field lookups for field names during indexing

[mgodwan]

Description

[Describe what this change achieves]

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[mgodwan]

|                                                Min Throughput |         index-append |     33224.3 |     40271.1 |   +21.21% :red_circle: |  7046.81 | docs/s |
|                                               Mean Throughput |         index-append |     34055.1 |     41137.8 |   +20.80% :red_circle: |  7082.76 | docs/s |
|                                             Median Throughput |         index-append |     33545.9 |     40755.3 |   +21.49% :red_circle: |  7209.38 | docs/s |
|                                                Max Throughput |         index-append |     38539.4 |     45043.9 |   +16.88% :red_circle: |   6504.5 | docs/s |
|                                       50th percentile latency |         index-append |     945.483 |     811.831 | -14.14% :green_circle: | -133.653 |     ms |
|                                       90th percentile latency |         index-append |     1530.14 |     1102.79 | -27.93% :green_circle: | -427.356 |     ms |
|                                       99th percentile latency |         index-append |     2868.97 |        1973 | -31.23% :green_circle: | -895.971 |     ms |
|                                     99.9th percentile latency |         index-append |     5670.84 |     2357.79 | -58.42% :green_circle: | -3313.05 |     ms |
|                                    99.99th percentile latency |         index-append |     6586.24 |     2776.86 | -57.84% :green_circle: | -3809.38 |     ms |
|                                      100th percentile latency |         index-append |     6849.79 |     2842.97 | -58.50% :green_circle: | -4006.81 |     ms |
|                                  50th percentile service time |         index-append |     945.483 |     811.831 | -14.14% :green_circle: | -133.653 |     ms |
|                                  90th percentile service time |         index-append |     1530.14 |     1102.79 | -27.93% :green_circle: | -427.356 |     ms |
|                                  99th percentile service time |         index-append |     2868.97 |        1973 | -31.23% :green_circle: | -895.971 |     ms |
|                                99.9th percentile service time |         index-append |     5670.84 |     2357.79 | -58.42% :green_circle: | -3313.05 |     ms |

[github-actions]

❌ Gradle check result for a8eb861: null

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?