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Add descriptions for index codec values (#3252) 

* Add descriptions for index codec values

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

* Switched default and best compression

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>

---------

Signed-off-by: Fanit Kolchina <kolchfa@amazon.com>
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_api-reference/index-apis/create-index.md
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@ -80,7 +80,7 @@ Setting | Description
index.number_of_shards | The number of primary shards in the index. Default is 1. index.number_of_shards | The number of primary shards in the index. Default is 1.
index.number_of_routing_shards | The number of routing shards used to split an index. index.number_of_routing_shards | The number of routing shards used to split an index.
index.shard.check_on_startup | Whether the index's shards should be checked for corruption. Available options are `false` (do not check for corruption), `checksum` (check for physical corruption), and `true` (check for both physical and logical corruption). Default is `false`. index.shard.check_on_startup | Whether the index's shards should be checked for corruption. Available options are `false` (do not check for corruption), `checksum` (check for physical corruption), and `true` (check for both physical and logical corruption). Default is `false`.
index.codec | The compression type to use to compress stored data. Available values are `best_compression` and `default`. index.codec | The compression type to use to compress stored data. Available values are `default` (optimizes for retrieval speed) and `best_compression` (optimizes for better compression at the expense of speed, leading to smaller data sizes on disk).
index.routing_partition_size | The number of shards a custom routing value can go to. Routing helps an imbalanced cluster by relocating values to a subset of shards rather than just a single shard. To enable, set this value to greater than 1 but less than `index.number_of_shards`. Default is 1. index.routing_partition_size | The number of shards a custom routing value can go to. Routing helps an imbalanced cluster by relocating values to a subset of shards rather than just a single shard. To enable, set this value to greater than 1 but less than `index.number_of_shards`. Default is 1.
index.soft_deletes.retention_lease.period | The maximum amount of time to retain a shard's history of operations. Default is `12h`. index.soft_deletes.retention_lease.period | The maximum amount of time to retain a shard's history of operations. Default is `12h`.
index.load_fixed_bitset_filters_eagerly | Whether OpenSearch should pre-load cached filters. Available options are `true` and `false`. Default is `true`. index.load_fixed_bitset_filters_eagerly | Whether OpenSearch should pre-load cached filters. Available options are `true` and `false`. Default is `true`.