feat(index): [AOU-1926] new field in index to look for DOI values regardless of case sensitivity

assigned to @Alicia.DeDiosFuente

added 3 commits

• ead1b027...18502566 - 2 commits from branch master
• 577e5299 - feat(index): [AOU-1926] new field in index to look for DOI values regardless of case sensitivity

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added 2 commits

• 6202fab4 - 1 commit from branch master
• dee70b46 - feat(index): [AOU-1926] new field in index to look for DOI values regardless of case sensitivity

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merged